Just discovered this song on Youtube. Love this beautiful jazzy kpop song by BTOB. Members of the boys group are Yook Sungjae (sub vocals), Lee Minhyuk (Lead Rapper), Joon II Hoon (Lead Rapper), Peniel Shin (Rapping), Lee Changsub (Lead Vocals),Seo Eungwang (Lead Vocals), and Im Hyun Sik (Sub Vocals). This Kpop group has a huge following in Korea and Japan.
For more info on the group just click this link http://kprofiles.com/btobs-members-profile/