Boyfriend (보이프렌드) KOREAN Boyfriend (보이프렌드) – Soulmate (열쇠) 열쇠 yeolsui “Soulmate” 야누스 2012.11.08 Donghyun, Hyunseong, Jeongmin, Kwangmin, Youngmin, Minwoo Lyrics/작사: 송수윤 Composer/작곡: DK Arranger/편곡: DK