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BTOB-BLUE (비투비-블루) is the first subunit of the boy group BTOB. Comprising of the group's vocal line (Eunkwang, Changsub, Hyunsik, and Sungjae), they debuted on September 19, 2016, with the digital single "Stand By Me".
See pics for more Eunkwang
Korean: 은광
Japanese: ウングァン
See pics for more Changsub
Korean: 창섭
Japanese: チャンソプ
See pics for more Hyunsik
Korean: 현식
Japanese: ヒョンシク