Jung Yoon-hak, who performs under the mononym Yoonhak, is a South Korean actor, model, and singer who made his anime voice acting debut in the musical anime project FLAGLIA. In this series, he provides the voice for the character Yuku, one of the main roles. The project is notable for its aim to connect anime and stage musicals, and Yoonhak’s involvement extended beyond voice work, as he was also announced to reprise his role as Yuku for the accompanying stage musical production, FLAGLIA The Musical: Yukite Kaerishi Monogatari. Prior to his entry into anime, Yoonhak was already an established performer. He is widely recognized as the leader of the South Korean pop group Supernova and a member of its sub-unit Double Ace. His broader entertainment career includes leading roles in television dramas such as My Unfortunate Boyfriend and Bouncer, as well as parts in films like Ichijiku no Mori. His role in FLAGLIA represents a significant crossover into the Japanese anime industry, marking a notable achievement as his first major voice acting credit.