AST1 recently contributed the song Yearning of the Heart to the Boys Before Flowers OST, and on April 3rd performed the song on KBS Music Bank, making it their comeback after 10 months of absence from the music scene. The 6 man group, with members from Korea, China and Japan, debuted in 2008 amidst controversy when they issued a challenge to Super Junior.
The group will release an album on April 13th.