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Yunsung (윤성) is a South Korean singer under LUK Factory. He is a member of the Korean Pop boy group NOIR.
- Stage Name: Yunsung (윤성)
- Real Name: Nam Yoonsung (남윤성)
- Birthdate: August 29, 1996
- Blood Type: A
- Height: 181cm
- Weight: 62kg
- Hobbies: Exercise
- Specialties: Urban dance
-  Produce 101 Season 2
- He was trainee for three years and three months prior to his appearance on Produce 101 Season 2.