- Stage Name: ACE (에이스)
- Birth Name: Kim Daesung (김대성)
- Birthdate: May 11, 1990
- Birthplace: Seoul, South Korea
- Height: 176cm
- Education: Dankook University
- On July 28, ACE confirmed that he was the one who physically attacked Chibin earlier this year and stated that he had left the group to take responsibility for the aggression against his bandmate.