If you search for “Young J (영제이)” online, you’ll quickly run into a problem:
- Sometimes you see jaw‑dropping dance performances from a world‑class crew.
- Other times you find Korean hip‑hop tracks and “Show Me The Money” clips.
Both are real, and both are Korean artists known as Young J (영제이) – but they are not the same person. One is a dancer / choreographer, the other a rapper.
This article clearly explains:
- Who Young J of Just Jerk is (dancer, choreographer, crew leader)
- Who Young Jay / Young J the rapper is (hip‑hop artist with albums and singles)
- Their verified biographies, career highlights, and, for the rapper, key discography
- How to tell them apart in searches, so you can quickly find the content you want
All details below are based on verified and reported information available up to December 28, 2025, and presented in a neutral, professional tone.
Who Is Young J from Just Jerk? (Dancer, Choreographer, Leader)
Quick Profile – Young J (Just Jerk)
- Name: Seong Young‑jae (성영재)
- Stage Name: Young J / YOUNG‑J (영제이)
- Date of Birth: February 22, 1992
- Main Roles: Founder and leader of Just Jerk; representative and instructor at Just Jerk Dance Academy
- Known For: Extremely precise group choreography, high musicality, and leading one of Korea’s most internationally visible dance crews
Young J is known not as a singer or rapper, but as a dancer, choreographer and crew leader. Through Just Jerk he has had a major impact on how Korean street / urban dance is seen internationally.
From Boxing Ring to Dance Floors – Early Life & Debut
Before becoming a globally recognized dancer, Seong Young‑jae boxed in his youth. A long 2018 feature article on Just Jerk describes him as “having done boxing” and later discovering dance while struggling with depression in his first year of high school.
According to that same profile, he fell in love with dance after watching Michael Jackson performances (“Billie Jean” and its moonwalk, in particular). He began practicing street styles such as popping, house and locking, eventually pulling his middle‑school friend Choi Jun‑ho (later Just Jerk member J‑Ho) into dance as well.
Around 2010, Young J and a small group of friends formally organized Just Jerk as an urban dance crew based in Seoul. Both NBC’s “America’s Got Talent” biography and Street Man Fighter documentation state that Just Jerk was established in 2010 with Young‑J as founder.
Just Jerk’s Rise to Global Fame
2016 – Body Rock Dance Competition (USA)
Just Jerk’s international breakthrough came with the 2016 Body Rock Dance Competition in San Diego, often called the “Academy Awards” of crew competitions. They placed first, reportedly the first South Korean crew ever to win the event, with a performance that later went viral on YouTube.
Their Body Rock set was widely praised for:
- Ultra‑tight synchronization in large formations
- Clever musicality and dynamic changes in energy
- A blend of hip‑hop, urban choreography and Korean traditional motifs
This win put both Just Jerk and Young J firmly on the global dance map.
2017 – “America’s Got Talent” (Season 12)
In 2017, Just Jerk appeared on America’s Got Talent Season 12. They passed the audition round with a standing ovation from judges and audience, then returned for the Judge Cuts stage, where their complex formations and timing again drew strong praise in U.S. entertainment coverage.
Although they did not go on to win the show, the AGT exposure:
- Greatly expanded their international fanbase
- Circulated their performance clips widely on YouTube and social media
- Introduced a mainstream U.S. TV audience to Korean street‑dance crews beyond the idol world
2018 – PyeongChang Winter Olympics Opening Ceremony
At the 2018 PyeongChang Winter Olympics Opening Ceremony, Just Jerk performed in the “Wish Fire” segment dressed as dokkaebi (traditional Korean goblin figures), dancing with flames and roller skaters as fireworks exploded around the stadium.
Korean and international coverage emphasized that:
- Just Jerk were used as a symbol of modern Korean street dance
- Their appearance at the Olympics showed dance crews being treated as part of Korea’s official cultural “face” to the world
For Young J as leader, stepping onto the Olympic stage was a major career milestone.
2022 – “Street Man Fighter” Champion
In 2022, Mnet aired Street Man Fighter (SMF), a high‑profile dance survival show for all‑male crews. Just Jerk competed and ultimately won the entire season, topping the live‑vote finals with 92,321 votes – more than double the runner‑up.
Highlights for Just J and Young J on SMF included:
- Highly structured, cinematic group pieces with complex patterns
- A reputation for near‑perfect synchronization even under live‑broadcast pressure
- A much‑discussed “Mega Crew” performance (set to cinematic music, often nicknamed “Groove” by fans) that many viewers still cite as one of the show’s standout stages
This win cemented Just Jerk’s status domestically as Korea’s leading male dance crew.
Work with K‑Pop & Stage Performers
Even though Young J is not a recording artist, his work is intertwined with the music industry.
Key verified points:
- Members of Just Jerk (including Young J) have worked as backup dancers and choreographers for SHINee’s Taemin, notably during the “Press Your Number” and “Danger” eras, as well as other SM performances.
- The 2018 JoongAng Ilbo feature notes that Just Jerk once directed choreography for Taemin to help fund their travel to overseas competitions.
- Just Jerk and their extended “Jerk Family” frequently appear as dancers, choreographers, or performance directors behind numerous K‑pop artists and TV dance projects, though individual credits vary by member.
Young J’s choreographic style is often described as:
- Sharp musicality: every accent and beat is considered
- Clean lines & synchronicity: particularly in large group formations
- Narrative staging: many routines build a visual or emotional story
Through these collaborations and appearances, he has helped shape how global audiences see “K‑dance” on major stages.
2024–2025: Controversies, Hiatus & Legal Case
This section summarizes reported, on‑the‑record information from Korean news outlets as of December 2025. Where claims are disputed, that is noted explicitly.
2024 – Relationship Controversy with Younger Team Member
In April 2024, multiple Korean media outlets reported allegations that an unnamed Street Man Fighter crew leader (identified by other reports as Young J of Just Jerk) had been in a problematic relationship with a much younger female team member who had joined his crew while still a minor. Some reports also relayed claims—coming from a former team member’s private social media—that she had become pregnant and undergone an abortion; these specific claims remain allegations, and Young J’s side has disputed parts of them.
Key points that are directly attributable to Young J’s own statements or his representatives:
- He acknowledged that the woman (often anonymized as “B”) had been a crew member and student born in 2005, and that they are in a romantic relationship.
- He stated that they began dating only after she legally became an adult in early 2024, and that he sought permission from her parents before starting a serious relationship.
- He admitted to favoritism toward her in rehearsals and opportunities, and said he apologized to other team members for that, while denying abuse‑of‑power in recruitment.
- His legal team announced plans to take action against what they called “groundless rumors” and malicious comments.
As coverage spread, public discussion in Korea focused heavily on:
- The 13‑year age gap (1992 vs. 2005 birth years)
- The teacher–student / leader–crew member power dynamic, even if the dating began after she turned 19
2024 – Suspension of Teaching at Just Jerk Academy
Following the controversy, Just Jerk Academy announced in mid‑April 2024 that Young J’s classes would be temporarily removed from the schedule, with other instructors taking over his time slots. Academy representatives described this as a kind of “sabbatical” or rest period requested by him.
Several outlets summarized the situation as Young J suspending teaching activities at the academy, while some commercial or advertising work could continue separately.
2024–2025 – Public Apology & Ongoing Relationship
On December 25, 2024 (KST), which he marked as Just Jerk’s “birthday” as a team, Young J posted a long statement on Instagram. In it he:
- Apologized for causing concern and disappointment with his “personal matters”
- Said he had spent difficult days reflecting on his actions and responsibilities as a leader
- Stated that he and his girlfriend were “continuing a pretty relationship, relying on each other,” while acknowledging that their relationship had confused and hurt some fans
Multiple news outlets in early January 2025 reported on this as his first substantial public update roughly eight months after the controversy broke.
Some earlier April 2024 reporting also quoted him as saying that both families had talked about marriage and that he considered the relationship “serious, not casual,” but there has been no verified announcement of an engagement or a fixed wedding date as of December 2025.
2025 – Military Service Allegations and Acquittal
Separately from the relationship issue, Young J faced legal scrutiny over his military service classification.
- Prosecutors alleged that between mid‑2020 and early 2021 he exaggerated or feigned panic‑disorder symptoms to obtain a medical certificate that led to a 4th‑grade “social service” classification instead of active‑duty enlistment.
- He was charged under the Military Service Act for alleged evasion by fraud.
On December 17, 2025, the Seoul Southern District Court found him not guilty at first instance, stating that the evidence did not prove he lacked a genuine mental health condition at the time of diagnosis. The judge held that it could not be concluded he had obtained the lower grade by false pretense.
Legally, this acquittal means that, as of the end of 2025, he has been cleared of criminal liability for the military‑evasion allegations, though public debate about the broader ethics of celebrity service classifications continues.
Impact on Korean Dance Culture
Despite the controversies, there is broad recognition that Young J and Just Jerk have significantly influenced Korean dance:
- They helped push street / urban choreography into the mainstream as an art form in its own right, not just as backup dancing for idols.
- Their large‑scale, story‑driven pieces at competitions and on shows like SMF helped popularize the idea of “mega crew” performances with cinematic staging.
- Through Just Jerk Academy and associated workshops, they have trained many younger dancers in Korea and overseas, spreading Just Jerk’s style and approach.
For many aspiring dancers, Young J represents a path to a full‑time career in choreography and performance outside the traditional idol‑trainee system.
Who Is Young Jay / Young J the Rapper? (Hip‑Hop Artist)
Quick Profile – Young J (Rapper)
- Stage Name: Young Jay / Young J (영제이)
- Real Name: Lee Joon‑ki (이준기) – often romanized as Joon‑ki Lee in English‑language hip‑hop media
- Born: Reported as December 28, 1993 (referenced in his own lyrics and fan profiles)
- Debut: 2013 single “All Day Go Hard”
- Crews / Labels: Associated over time with Rhydmeka, GUE / Guereallaz, and the #DoItAllNight collective, among others
- Style: Primarily boom‑bap‑oriented Korean hip‑hop with dense rhyme schemes and classic, sample‑based production
This Young J is a rapper, not a dancer, and his career has unfolded mostly in the Korean hip‑hop scene, including underground activity, official releases, and a stint on Show Me The Money 777.
Early Years & Underground Activity
Before officially debuting, Young Jay began making a name for himself through mixtape releases as a teenager. A Bugs Music write‑up of his first album notes that he started to get recognized in the scene around age 19 via mixtapes, before moving on to commercial releases.
During this early period he appeared at small shows and cyphers, built connections with other underground artists, and developed a reputation for:
- Straightforward, autobiographical lyricism
- Preference for raw boom‑bap beats over trendy sounds
Official Debut & First Releases
2013 – Single “All Day Go Hard”
Young Jay’s official debut came with the single “All Day Go Hard”, released through his independent JAY WORLD imprint and distributed by Luminant Entertainment.
The track’s themes center on:
- Work ethic and determination
- Aspiration to rise from a smaller city background into Seoul’s music world
For listeners who like classic hip‑hop attitudes, it introduced him as a skill‑focused MC.
2013 – EP “No Stress, No Drama”
Later in 2013, he released the 5‑track EP “No Stress, No Drama”. Digital stores and lyric archives list it as a Korean hip‑hop EP with guest appearance from respected rapper Wutan on the title track.
The project explores:
- Brushing off unnecessary drama
- Trying to stay focused on personal goals and self‑development
It is widely regarded among fans as his first cohesive body of work.
Albums, Growth & “Show Me The Money 777”
2015 – 1st Full Album “From Paju To Seoul”
In May 2015, Young Jay released his first full‑length album “From Paju To Seoul” (10 tracks, 32 minutes). The album description on Bugs explicitly calls it his “first regular (full) album.”
- Concept: The title reflects his journey from his hometown Paju to Seoul, where Korea’s hip‑hop and entertainment industries are concentrated.
- Themes: Ambition, personal history, family, and the struggles of relocating to chase music.
- Representative tracks (confirmed track list):
- “From Paju To Seoul” (title track)
- “I Do What I Gotta Do”
- “비워 (Empty)”
- “Me & My Family”
Notably, the album features no guest rappers; the Bugs write‑up emphasizes that he carries all ten tracks alone, which underscored his intent to present a strongly personal statement rather than a feature‑heavy project.
2018 – 2nd Full Album “The Boy”
In January 2018, hip‑hop outlet HiphopKR reported that Young Jay had released his second full‑length album, “The Boy”, along with a music video for the title track “삼켜 (I Know)”.
Key facts from that report:
- “The Boy” contains 10 tracks.
- Featured artists include Don Mills, Nucksal, Yumdda, ODEE, X.Q, and Bassagong.
- The narrative frames the change from a 19‑year‑old Lee Joon‑ki who left Paju, to a late‑20s Young Jay who has seen friends and peers succeed, marry, or drift away, leaving him to reflect on his own path.
Representative tracks:
- “I Know (삼켜)” – the title track and music video focus, with emotional, mid‑tempo production.
- “Dayone (feat. Nucksal)” – an ode to long‑time comrades, produced by ZAYSTIN and released digitally on Korean platforms like Bugs.
2018 – “Show Me The Money 777”
Young Jay participated in Mnet’s rap survival show “Show Me The Money 777” (SMTM777) in 2018. Fan‑curated discography resources and show documentation list him as a contestant that season.
While he did not win the competition, simply appearing on SMTM typically brings:
- A spike in public visibility
- New listeners discovering back catalog tracks such as “From Paju To Seoul” and “The Boy”
- Additional performance and collaboration opportunities in the Korean hip‑hop scene
Style, Influences & What Makes Him Distinct
Young Jay stands out for maintaining a boom‑bap / classic hip‑hop sound in an era where trap and melodic rap dominate Korean charts.
Characteristics of his style (based on his discography):
- Multi‑syllabic rhymes & dense flows – especially evident on tracks like “Dayone” and “They Know”.
- Storytelling & self‑reflection: “From Paju To Seoul” and many of his singles document specific life stages, from part‑time jobs to crew life in Seoul.
- Classic aesthetics: production leans toward drum‑heavy, sample‑driven beats rather than glossy pop‑rap.
For listeners who prefer lyric‑centric Korean rap grounded in traditional hip‑hop textures, his catalog is a natural fit.
Young J (Rapper) – Discography & Song Guide (Key Works)
This is not a complete discography, but focuses on the best‑documented core releases.
EPs & Albums
EP: No Stress, No Drama (2013)
- Format: 5‑track EP released via Luminant Entertainment.
- Notable track: “No Stress No Drama (feat. Wutan)” – often the song most associated with the project.
LP: From Paju To Seoul (2015) – 1st Full Album
- 10‑track album portraying his move from Paju to Seoul and the realities of life and work in the city.
- Key tracks:
- “From Paju To Seoul”
- “I Do What I Gotta Do”
- “비워 (Empty)”
- “Me & My Family”
LP: The Boy (2018) – 2nd Full Album
- 10‑track project with heavier focus on adulthood, uncertainty, and friendships over time.
- Key tracks:
- “I Know (삼켜)” – title track
- “Dayone (feat. Nucksal)”
Selected Singles & Notable Tracks
From discography listings and digital stores, some of his more visible singles include
- “All Day Go Hard” (2013) – debut single
- “지나쳐 (Passing By)” (2014) – single featuring Blnk‑Time, depicting late‑night Seoul scenes
- “아무것도 아냐 (Nothing)” (2015) – introspective single produced by Royal Dive
- “They Know” (2016) – smoother, melodic song dealing with relationships and jealousy
- “Hit Me Up (feat. X.Q)” (2016) – R&B‑leaning collaboration
- “Cats and Dogs (feat. Yumdda, ODEE)” (2017) – fan‑favorite track tying him more closely to other well‑known underground names
As with many underground Korean rappers, there are also numerous features and digital singles beyond these core releases.
Streaming Platforms & Name Confusion
Because “Young J / Young Jay / YOUNGJ” are fairly common stage names, multiple artists worldwide use similar monikers. As a result, some platforms mix or auto‑group releases under similar names.
To more reliably find the Korean rapper Young Jay (영제이):
- Use Korean search terms such as “영제이 래퍼”.
- Search by confirmed album titles: “From Paju To Seoul”, “The Boy”, or EP “No Stress, No Drama”.
- Check for past associations like Rhydmeka or Guereallaz / GUE in descriptions.
Young J vs Young Jay – How to Tell Them Apart
Different Fields, Same Name
Young J (Seong Young‑jae) – Dancer / Choreographer
- Field: Street / urban dance and choreography
- Known for:
- Founding and leading Just Jerk
- Winning Body Rock 2016, Street Man Fighter 2022
- Performing at the 2018 PyeongChang Olympics Opening Ceremony
- Work as a dance coach and academy head (Just Jerk Academy)2
- Typical content: Dance videos, performance clips, TV dance shows, workshop footage
Young J / Young Jay (Lee Joon‑ki) – Rapper
- Field: Korean hip‑hop / rap
- Known for:
- EP “No Stress, No Drama”
- Albums “From Paju To Seoul” and “The Boy”
- Appearance on Show Me The Money 777
- Typical content: Music videos, audio tracks, live rap performances
Practical Search Tips for Fans
If you want dance content:
- Search:
- “Young J Just Jerk”
- “영제이 저스트저크”
- “스트릿 맨 파이터 저스트절크 영제이”
If you want the rapper and his songs:
- Search:
- “Young Jay rapper”
- “영제이 래퍼”
- “From Paju To Seoul 영제이”
- “The Boy 영제이”
Using Hangul (Korean script) plus context keywords (댄서 vs 래퍼, Just Jerk vs From Paju To Seoul) dramatically reduces confusion.
FAQs About Young J (영제이)
Q. Are the dancer Young J and rapper Young Jay the same person?
No.
- Young J (Seong Young‑jae) – leader of Just Jerk, dancer and choreographer.
- Young J / Young Jay (Lee Joon‑ki) – Korean rapper active in the hip‑hop scene.
Q. Does Just Jerk’s Young J have any official songs?
Not as a vocalist or rapper. His professional work in music is via:
- Choreography and performance for other artists’ songs
- Appearances on TV shows and stages (e.g., AGT, Street Man Fighter, PyeongChang 2018)
Q. Has the rapper Young J ever worked with Just Jerk?
As of the latest available information up to December 2025, there are no widely documented or high‑profile collaborations between:
- Just Jerk leader Young J (the dancer) and
- Rapper Young Jay (the MC)
Q. Where can I listen to Young J (rapper)’s music?
You can find Young Jay (영제이, the rapper) on:
- Korean platforms: Melon, Genie, Bugs (search “영제이” + album titles like “From Paju To Seoul”)
- Global platforms: Spotify, Apple Music, Amazon Music, YouTube Music, often under “Young Jay” or “영제이”.
