B2ST and BTOB joined force

B2ST and BtoB have joined force for this new song "Bye Bye Love". An Original Sound Track for the Korean Drama, "When a Man Falls in Love" starring Song Seung Hun. It is a catchy tune with great melody. It shows off great quality of the four voices: Yoseob and Dongwoon of B2ST, and Changsub and Ilhoon of BTOB.