Jin Yong Hoon is a South Korean singer, musician and member of ONEWE (원위; previously known as MAS 0094 and MAS). He attended the Applied Music program at Dong-Ah Institute of Media and Arts but dropped out. Originally named MAS 0094, he made his debut in August 2015 as the group's leader, main vocalist, guitarist and keyboardist with their first single, "Butterfly, Find a Flower". They were represented by Modern Music but were treated almost like an independent group. In April 2017, they decided to switch agencies and signed with Rainbowbridge World (알비더블유) and shortened their group name to MAS with some of the members entering singing survival competitions representing their new agency. In June 2018, RBW announced the group will rebrand as ONEWE and officially re-debuted in May 2019 with their first single album, "1/4". He enlisted for his mandatory military service on July 12, 2022 and was discharged on January 11, 2024.

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