Riddle of the Day

His group debuted before Sechs Kies and their popularity was well known.
His group debuted in 1996 (exactly a year before Sechs Kies).
They were together until 2001.
He was the lead singer of his group until they disbanded and then went on for a solo career.
The member I am most concerned with has been in the Chinese version of one of my fav dramas.....although I haven't seen that version yet.
Has written 2 songs for That Winter, The Wind Blows, a drama I have not finished watching....it's just too heart-breaking.
Most importantly the main single off of his album sounds very similar to a little baby-face I know of.