On August 8, 2011, he appeared in Seo In Guk's "Shake It Up" MV.
On January 25, 2012, he appeared in Zhu Minkui's "Let This Die" MV; on May 24, he released his first single album "SUPER HERO" with the group and officially debuted; on August 14, it was released Single album "Rock Ur Body"; on December 6, participated in JellyFish Entertainment's Christmas special "Jelly Christmas 2012 HEART PROJECT" and sang "Because It's Christmas" with Sung Si Kyung, Park Hyo Shin, Lee Seok Hoon and Seo In Guk.
On January 17, 2013, the single album "On and On" was released; on May 20, the first mini album "hyde" was released, based on the story of "Dr. Jekyll", but due to Horrible makeup and props appeared in the MV, and it was judged that people under the age of 19 were not allowed to watch it. On July 31, the second mini album "Jekyll" was released, with the concept of "Monster Doctor" and the title song is "G.R.8" .U"; On October 11th, he collaborated with OKDAL to create the album "Y.BIRD from Jellyfish Island"; On November 8th, he released the first album's preview song "The Answer is You"; On November 25th, he released his first album "VOODOO", the title song is "Voodoo Doll", and won the first number one on "Music Bank" with the title song; on December 10, JellyFish was released with Sung Si Kyung, Park Hyo Shin, Seo In Guk, and the special female voice "Sister" Entertainment Christmas single "Winter Proposes".
On January 22, 2014, his group VIXX won the main prize at the 23rd Seoul Music Awards; on May 27, the single album "ETERNITY" was released, with the concept of "the fantasy of time". After its release, it won the first place in the Korean music charts Naver Music and Bugs; on October 14, the third mini album "Error" was released, with the concept of "robot"; on July 2, the first Japanese album "DARKEST ANGELS" was released ” and debuted in Japan. The album won the weekly championship on the Tower Record comprehensive album chart.
On January 14, 2015, the group VIXX won the main award of the album category at the 29th Golden Disc Awards; on January 22, the group VIXX won the main award at the 24th Seoul Music Awards. ; On February 24, the first special single album "Boys' Record" was released. The title song is "Farewell Formula", which is adapted from the song released by R.ef, a Korean boy group in the 1990s, in 1995.
In March 2016, he starred in the musical "Mata Hari", playing the role of an innocent man who ignores the splendor and noise of the Moulin Rouge stage and loves Mata Hari with his heart.