The group stands for 'Adventure Calling Emotions' and is made of leader Jun, Donghun, Wow, Jason, and Chan. Jun already has musical experience and had been on 'I See Your Voice 4'. Jason is from 'K-Pop Star 2', and Donghun is from 'Superstar K5' and has also been on 'I See Your Voice 4'.
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Check out the song and MV above.