Yoon Ji-Sung was born in Wonju, Gangwon Province, on March 8th, 1991. He is a South Korean pop singer and a former member of the boy band Wanna One. On March 9th, 2017, Yoon Ji-Sung appeared on the Mnet music program "M! Countdown" and officially made his public debut as a trainee under MMO Entertainment. On April 7th, he joined the Mnet music survival program "Produce 101 Season 2" and successfully won a debut spot. On July 1st, he and his group held a "Produce 101 Season 2 Finale Concert" in Korea. That same year, Yoon Ji-Sung officially debuted as a member of Wanna One.