While Jaejoong and Yunho went on to debut as TVXQ in December 2003, Heechul and Kangin joined ten other trainees under S. Entertainment to form the group "Super Junior 05", the first generation of Super Junior.
In December 2016, he confessed, he was preparing to debut as Trax main vocalist.
He didn't participate in any of the stage shows, including the end-of-year award shows For 3 months.
And while she has released songs, she hasn't really had promotions lately.
They released their debut single, "Close Ur Mouth", in June.
Heechul wrote the lyrics and directed the music video for the song, while Jungmo produced and performed the instrumental.
Subsequently, he graduated from Chungwoon University with a master's degree in industrial design.
In October 2002, he auditioned to become a singer through the Starlight Casting System, and was initially placed in a four-member group called "Four Seasons" along with Jaejoong, Yunho and Kangin.