Rocketed to fame in 2015 as a member of the TOP Media K-pop group UP10TION. The group released their debut album Top Secret in 2015 and followed with BRAVO! and Spotlight. He also appeared in Produce X 101 in 2019.
He was an apprentice at Top Media for a year before he was the first member to be revealed in UP10TION.
In 2016, he was featured as a special MC on an episode of SBS MTV's The Show.
His real name is Kim Woo Seok. He was born in Daejeon, South Korea.
Like Hwanhee, he is a popular South Korean singer.