BtoB Blue
BtoB Blue 비투비-블루 | |
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| Origin | Seoul, South Korea |
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| Spinoff of | BtoB |
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BtoB Blue (Korean: 비투비-블루) is the first official sub-unit of South Korean boy band BtoB formed under Cube Entertainment in 2016. The sub-group consists of the group's vocal line Seo Eun-kwang, Lee Chang-sub, Im Hyun-sik and Yook Sung-jae. The sub-unit debuted with their digital single titled "Stand By Me" on September 19, 2016.