Mizuguchi Yuto, previously known as U and known professionally as Yuto, is a Japanese singer, dancer and member of ONF (온앤오프; short for ON N' OFF).

Before debuting, he was a trainee at JYP Entertainment for one year, and after switching companies, he was introduced as part of WM Boys with their first appearance as B1A4's backup dancers at the 2016 Dream Concert in Seoul. He gave a performance, alongside his groupmates, at IDOLCON just a few months before debuting.

He made his official debut in August 2017 as the group's OFF Team member, main dancer, sub-vocalist and current maknae 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, holding a concert in Tokyo. In 2020, all the members entered MNet's "Road to Kingdom" and finished in 2nd place, and he had his acting debut with a role in the web drama "Can I Step In?".

In 2021, all members (except for him due to his Japanese citizenship) decided to enlist for their mandatory military service around the same time. The following year, he entered "Be Mbitious” in order to be selected as part of Rain's crew that was going to compete in "Street Man Fighter", but he was eliminated in the preliminary auditions.

He returned to Japan and spent time with his family while waiting for the others to be discharged from the military. After their release in June 2023, the group became active again.

He was represented by WM Entertainment (WM엔터테인먼트).

On March 5, 2026, he signed an exclusive contract with KI Entertainment. He also officially changed his stage name to Yuto, which is his real name.

(Source: MyDramaList) Edit Biography