A.M (에이엠) is a South Korean artist under STARENT. He is a member of the Korean Pop boy group LIMITLESS.
- Stage Name: A.M (에이엠)
- Birth Name: Seong Hyunwoo (성현우)
- Birthdate: December 31, 1996
- Blood Type: A
- Height: 181cm
- Weight: 62kg
- Hobbies: Watching movies alone, looking at people
- Specialties: Super power
- [2018.03.06] Jang Moon Vok - Peeps (#1 Gogseong 2018 (With Sapo, Seong Hyun Woo)), (#3 Real Fact (With Seong Hyun Woo, Yun Hee Seok)), (#6 Geobmeogjima (With Seong Hyun Woo))
- He was trainee for four years and seven months prior to his appearance on Produce 101 Season 2.
- He was a trainee under The Vibe Label.