Yearning of the heart

A minute ago while im on Youtube a familiar song has been played automatically and i think i clicked somethings else that i wont noticed with, this song yearning of the heart, if you could remember, this was the one of the Tv series Boys over Flower background song way back time and i wasn’t know that this kpop group AST’1 is the one who sung this(now i know..LOL)..ok just want to share this video to you all to reminisce your crazing on the Tv Series before..LOL thanks a lot