Nam Yoon Sung is a South Korean singer managed by LUK Factory. He is a member of the boy group NOIR. He participated in 'Produce 101 Season 2' as a member of I-One Entertainment and rose from Class F to Class C, raising expectations, but dropped out of the program due to health reasons.

On August 19, 2022, he was found guilty of breaking and entering, assault, and threatening with a deadly weapon. Nam had been harassing his ex for two weeks before the incident took place, where he broke into her house and threatened her with a knife asking her to get back together with him. When she refused his orders, he got outraged and tried to strangle her. He was sentenced to one year in prison, suspended for two years, and 80 hours of community service. Edit Biography