Seong Hyun Woo is a South Korean singer. He rose to fame after competing in the reality show “Produce 101 Season 2.” He also makes a guest appearance on “LEGENDARY: Making of a K-Pop Star,” a 2017 Viki Original series that follows Alex Christine, the winner of “Rising Legends: Season 2,” as she travels from her hometown in Oklahoma to Seoul to experience the K-pop star treatment for the first time.