mustard seed 겨자씨 만한 믿음이 있다면… Credit Composed W24 Lyrics by W24 Vocal by 정호원 Guitars by 김윤수 Bass by 김예일 Keyboards by 박아론 Drums by 김종길 Background vocals by 김종길, 정호원, 김윤수 Mixed by 김한구 at sound POOL studio Masterd by heeljack@ highdrive