Famous composer Yoon Il Sang recently released new album "I'm 21" in celebration for his 21st year anniversary in the music industry. He personally selected some of his own favorite hits and collaborated with hottest artists to create modern remakes of his songs.

Brown Eyed Girls member Ga-In and pink rock band No Brain participated in the fourth round of Yoon Il Sang's 21st anniversary album. Ga-In remade As One's "For You Not To Know", which was released back in 1999.

Check out Ga-In's remake track below!