Mark Tuan—born Mark Yien Tuan (Chinese: 段宜恩,Duàn Yí'ēn; Korean: 마크투안 or 단의은, Dan Uieun) on 4 September 1993), and known mononymously as Mark or 마크—is a South Korea-based American rapper, singer, songwriter, and model. He is a member of the South Korean boy band GOT7, formed under JYP Entertainment.