Yuto Mizuguchi (水口悠斗; read Mizuguchi Yūto) or better known by his stage name U, is the main dancer and maknae of K-Pop boy group ONF. Born in Japan at March 16, 1999, he’s the member of ONF’s OFF team which consists of him, J-US, and Wyatt. He helped creating choreography for some of ONF’s songs and in charge of editing some of their self-made MV.