Yoon Seo Bin is a South Korean singer and actor under Sublime Artist Agency. He was a Korean pop trainee for one year and seven months under JYP Entertainment prior to his appearance as a contestant on the boy group survival reality show Produce X 101. After the airing of the first episode of the show, he was removed from JYP Entertainment and Produce X 101 due to rumors claiming that he was involved in severe bullying, underage drinking, and underage smoking when he was in elementary and middle school. He has apologized for this controversy surrounding his past ignominious actions through a handwritten letter of apology that he posted on Instagram.