KNK (크나큰) KOREAN KNK – Angel Heart (마음씨) 마음씨 maeumssi “Angel Heart” [Single] KNOCK 2016.03.03 Youjin, Seungjun, Inseong, Jihun, Heejun Lyrics/작사: 서미래 Composer/작곡: 니켈 Arranger/편곡: 니켈