KOREAN Red Velvet (레드벨벳) Red Velvet – Happiness (행복) (OT5 Ver.) 행복 haengbok “Happiness” [Single] 행복(Happiness) 2014.08.04 Original version here Irene, Seulgi, Wendy, Joy, Yeri Lyrics/작사: 유영진 Composer/작곡: Will Simms, Chad…