[2] He debuted in 1997 as a member the group Space A and released his first solo album in 2002.

He has released a total of five albums in Korean and one in Mandarin.

[3][4] As a vocal coach, he has taught K-pop singers including members of Girls' Generation (most notably Taeyeon) and Super Junior.

[5] He won the second season of the Korean version of I Am a Singer in 2012,[6] and finished in third place in the third season in the Chinese version of I Am A Singer in 2015.

[7] Singers participated in groups are listed in parentheses.