Yoon Jisung (윤지성; or Jisung) is a South Korean singer-songwriter under DG Entertainment. He is best known for finishing 8th in Produce 101 Season 2 and becoming a member and the leader of Wanna One until their disbandment.
He is also a member of the project group LUNA under the name Yuchan (유찬).
He made his solo debut on February 20, 2019 with his first mini album Aside.
Jisung enlisted for his military service as an active duty soldier on May 14, 2019. He was discharged early on November 20, 2020, following the COVID-19 protocol and was officially discharged on December 13.