Lee Jun-young (; born January 22, 1997), also known as Jun, is a South Korean singer, rapper and actor who debuted as a member of the boy band U-KISS in 2014. He joined the survival program The Unit (2017–18) and won to become the center and main vocalist of the project group UNB. As an actor, he has achieved wider recognition for his roles in several projects, such as Class of Lies (2019), D.P. (2021), Love and Leashes (2022), Mask Girl (2023), When Life Gives You Tangerines (2025), Weak Hero Class 2 (2025), Reborn Rookie (2026) and Four Hands, Two Sonatas (2026).
Lee has been noted for his strong acting skills paired with his diverse and unique role selections, earning him descriptions such as "the acting god" or "the most unconventional" among actors of his generation. Beyond his work in music and acting, he has participated in musical theatre, dance battles, variety programs, art exhibitions, and hosting activities, which has led some to describe him as a "hexagonal trendsetter" for his versatility across multiple fields.
Career 2014–2016: Career beginnings with U-KISS On May 15, 2014, NH Media announced new member Jun to the public via U-KISS's official Korean website. On June 2, 2014, he made his debut with U-KISS and the group released its 9th mini album Mono Scandal along with the 19+ rated music video of the album's title track "Quit Playing". In the same year, U-KISS also released their 9th Japanese single album LOVE ON U and kicked off the U-KISS JAPAN LIVE TOUR 2014, which was held in Nippon Budokan, effectively starting his career in Japan. In December 2014, U-KISS made another comeback with their 10th Japanese single album Sweetie.
In 2015, U-KISS started the year with their 10th mini album Always, followed by their 4th Japanese regular album Action in March and 11th Japanese single album Stay Gold in September. In 2016, U-KISS made another comeback with their 12th Japanese single album Kissing to feel, 5th Japanese regular album One Shot One Kill, 11th mini album Stalker, and 13th Japanese single album PaNiC!. Unfortunately, the 11th mini album Stalker was the last Korean comeback Jun had with U-KISS until his contract ended in 2021, since NH Media decided to focus on the Japanese market entirely.
2017–2021: UNB and acting breakthrough In 2017, Lee debuted as an actor in the tvN Wednesday-Thursday drama Avengers Social Club. It was based on the webtoon titled "Buam-dong Avengers Social Club" by Sajatokki, serialized on Daum. He played the role of Lee Soo-gyum, a third-year student at Saebit High School and the youngest member of the Bokja Club. Lee Soo-gyum was the illegitimate child of Lee Byung-soo (played by Choi Byung-mo) and he had a decisive role in leading Kim Jung-hye (played by Lee Yo-won) to form the Bokja Club. He was also the actual brain behind the Bokja Club, and he joined the club to take revenge on his father, who used him to secure the company's succession.
On October 28, 2017, Lee joined the KBS2 survival program The Unit. During the audition, he performed "Dang Dang Dang", a hip-hop rap song by Supreme Team, and received the first Super Boot evaluation on the show from the audience. He was ranked 6th in the first week, 3rd in the second week, and 2nd in the third week of the interim ranking result. However, on the first official ranking announcement, he took the 1st rank and was consistently holding the rank thereafter. In the final announcement, he was ranked 1st of the Top 9, debuting as the center. He also made it to 3rd place on the Non-Drama Performers Category list by Good Data Corporation during the show's final week. He then promoted with UNB, which consisted of finalists from the show, from April 7, 2018, to January 27, 2019.
From April to May 2018, Lee appeared as "Compass" on MBC's TV program King of Mask Singer. In the first round, he performed a duet with Lee Sang-hoon of "It Was Like That Then". For the second round, he performed a solo cover version of "Eraser". In May 2018, he made his second acting appearance as Han Min-soo in the MBC television series Goodbye to Goodbye (2018) and received the Best New Actor award at the 2018 MBC Drama Awards. On April 10, 2019, Lee released his first Japanese solo single "Phenomenal World", which explored the futurepop genre. He performed his first solo showcase in Tokyo on February 4. Prior to the release, he also held a series of concerts on April 6 in Osaka and April 8 in Tokyo. Tower Records Japan ranked "Phenomenal World" as the #7 best-selling Japanese single by a Korean artist for the first half of 2019. He then starred in the OCN television series Class of Lies, which aired from July 17 to September 5. On November 6, he released both a Korean and Japanese version of his solo single "My Way", for which he wrote the lyrics. The single featured rapper Reddy and was produced by Sway D, accompanied by two music videos. After a digital download was released on October 30 the Japanese version ranked #2 on the dwango.jp K-POP Life Weekly Singles Chart. On November 28, he released his first Korean solo single "TELL" composed by himself as a pre-release for his album Gallery. On December 5, he made his solo debut in Korea with the title track "Curious About U" and the single album Gallery.
In 2020, Lee released his first solo Japanese mini album 22 on January 22, which is also his birthday. The album featured six songs, from ballads to rap and dance numbers.
Also in 2020, he acted in the musical Swag Age: Shout Out, Chosun! and received the Best New Actor award at the fifth Korea Musical Awards. In April 2020, he played Kang Woo-won in the SBS drama Good Casting (2020), which was entirely pre-produced. In June 2020, he made a special appearance in the SBS drama Backstreet Rookie as a high school student who stole a college student's overcoat to buy cigarettes. In October 2020, he acted in the MBC Every 1 drama Please Don't Date Him. He participated in the soundtrack for the drama with the single "To You Who Will Be Tired". On October 7, he released the Korean single "Amen", which highlighted rap and hip-hop.
In May 2021, Lee starred in the KBS2 drama Imitation (2021) as Kwon Ryok, an idol-actor and center of fictional idol group SHAX. As a SHAX member, he participated in the songs "MALO", "AMEN", and "Your Sign (SHAX ver)". In the first two mentioned songs, he mainly took over the rap. As Kwon Ryok, he participated in the song "Your Sign" with the cast and "My Old Story" sung in duet with Jiyeon of T-ara. All the songs are available on various music streaming services.
After departing NH Media in August, Lee announced in November that he co-founded a new company, J-flex, which will serve as his current agency for his acting projects. In August 2021, he appeared in the third episode of the Netflix series D.P. as deserter Jung Hyun-min. In order to digest the intense action scenes, he learned boxing with actor Jung Hae-in, who played Ahn Jun-ho in the series, for a few months at an action school before filming. As the action scenes were shot without a stunt double, he received praise for his swift and accurate movements. In November 2021, he starred in the SBS drama Let Me Be Your Knight as Yoon Tae-in, a songwriter and vocalist of fictional band LUNA. As a member of LUNA, he sang several songs: "Beautiful Breakup", "Midnight Fantasy", "Let Me Be Your Knight", "Love Paranoia", and "Rock & Roll Tonight". He also sang a song titled "Love One Day" by himself.
2022–2024: Rising popularity In February 2022, Lee starred in the Netflix movie Love and Leashes, an adaptation of the webtoon titled "Moral Sense" on the topic of BDSM. He starred alongside Seohyun (Jung Ji-woo) as Jung Ji-hoo, a newly transferred assistant manager from the business team. Outwardly, he is a nice and popular superior, but inwardly, he hides secret desires. In October 2022, he starred in the MBC drama May I Help You alongside Hyeri. The drama was filmed from June 1, 2022 to December 9, 2022. He played the role Kim Tae-hee, who referred to himself as the 100-won butler that can do any kind of errand as long as you paid him. He also sang an OST titled "A Fine Day" for this drama.
In 2023, Lee starred in the movie Brave Citizen, based on the webtoon of the same name. He starred alongside Shin Hye-sun (So Si-min) as Han Su-gang, a high school bully that's described as a vicious villain that has never been seen before. The filming period was from December 30, 2021 to April 5, 2022 and the movie became available in theaters starting from October 25, 2023. In August 2023, he appeared as the villain in the fourth episode of the Netflix series Mask Girl. His acting in Brave Citizen and Mask Girl earned him the Best Acting Performance Award at the 2023 Asia Artist Awards.
In January 2024, Lee starred in the Netflix movie Badland Hunters alongside Ma Dong-seok, Lee Hee-joon, and Roh Jeong-eui. In February 2024, he starred in the Disney+ series The Impossible Heir alongside Lee Jae-wook. In May 2024, he starred in the TVING series Dreaming of a Freaking Fairytale alongside Pyo Ye-jin.
2025–present: Breakthrough to mainstream, music comeback, and further success In February 2025, Lee made a cameo appearance in the tvN and TVING historical drama The Queen Who Crowns. He was praised for his portrayal of King Sejong in his first historical drama role. In the same month, he starred in the Netflix series Melo Movie as Hong Si-jun, an aspiring musician who met Son Ju-a (Jeon So-nee) again, his ex-girlfriend of seven years. He showcased his singing skills by performing the OST titled "Under Sunset" entirely in English.
In March 2025, Lee starred in a supporting role as Park Yeong-bum, the first love of IU's character Yang Geum-myeong, in the Netflix series When Life Gives You Tangerines. He was recognized in the buzzworthy Drama Performer Category by Good Data Corporation, ranking 4th in the third week of March and 8th in the fourth week.Good Data Ranking
Week 10th, 2025: Week 11st, 2025: Week 12nd, 2025: Week 13th, 2025: Week 14th, 2025: Week 15th, 2025: Week 16th, 2025: He also appeared in the Netflix series Weak Hero Class 2 as antagonist character Geum Seong-je, which aired on April 25. At the 2025 Fundex Awards, he received a double nomination in the Best Supporting Male Performer on OTT Category for his roles in the two aforementioned works, and eventually won for his role in Weak Hero Class 2. Due to his frequent appearances in OTT series, he is sometimes referred to as "OTT Prince", "OTT Son", or "OTT Civil Servant".
Lee then starred in the KBS2 drama Pump Up the Healthy Love (2025) alongside Jung Eun-ji as Do Hyeon-jeong, a gym manager who transformed his life through exercise despite being born smaller than the size of a 1.5-kilogram dumbbell. For this role, he won the Excellence Award, Actor in a Miniseries from the 2025 KBS Drama Awards. He also won the Popularity Award and Best Couple Award (with Jung Eun-ji) along with receiving a nomination for the Top Excellence Award for an Actor.
On September 22, Lee made a comeback as a singer with his first mini album Last Dance. The album contained two title tracks, the hip-hop track "Bounce" and the ballad "Why Are You Doing This to Me". He also participated in writing and composing the track "Mr. Clean". Since the album consisted of various genres such as dance, ballad, and hip-hop, critics have referred to him as an all-rounder.