B2ST members show that they're each other's best cheerleaders, taking an active approach to showing their support for member Doojoon and his tvN drama 'Let's Eat 2'!
Yoseob, who also made a cameo in the drama, has lent his beautiful voice with the OST "Why Don't You Know" co-composed by Junhyung and composer Kim Tae Joo.
The song "Why Don't You Know" first appeared in a scene in the May 19 episode, and has now been released, so give it a listen!
SEE ALSO: Kim Tae Hee reveals the moment she felt her absolute prettiest
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