f(x) (에프엑스) KOREAN Super Junior (슈퍼주니어) SuJu Leeteuk & f(x) Krystal – Grumbling (CC Lyrics) 투정 tujeong “Grumbling” Leeteuk, Krystal Lyrics/작사: ??? Composer/작곡: ??? Arranger/편곡: ???