Shim Jae Young, known professionally as Wyatt, is a South Korean singer, dancer and member of ONF (온앤오프; short for ON N' OFF). He graduated from Hanlim Entertainment Arts High School and is currently enrolled in the Broadcasting Entertainment program at Global Cyber University. Before debuting, he lived in Kazakhstan for 5 years and later was a trainee for 7 years before being introduced as part of WM Boys with their first appearance as B1A4's backup dancers at the 2016 Dream Concert in Seoul. He was featured as a dancer in the Korean version of the web drama "Loss:Time:Life" and gave a performance at IDOLCON just a few months before debuting. He made his official debut in August 2017 as the group's OFF Team member, main rapper and lead dancer with their 1st EP "ON/OFF". In 2018, the group signed a contract with Victor Entertainment (ビクターエンタテインメント) and made their Japanese debut and held a concert in Tokyo. In 2020, all the members entered MNet's "Road to Kingdom" and finished in 2nd place. He also had his acting debut with a role in the web drama "Can I Step In?". In 2021, all members (except U) decided to enlist for their mandatory military service around the same time, so he enlisted on December 27 and was discharged on June 26, 2023. After being released, the group is now active again and is represented by WM Entertainment (WM엔터테인먼트).