Four former contestants of Mnet's vocal survival program 'Build Up' have teamed up once again to make their debut as the vocal group, WaterFire. 

Made up of members Sunyoul, Wumuti, Choi Suhwan, and Kang Hayoon, WaterFire is the first 'Build Up' alum group to kick off their debut promotions, greeting fans ahead of the survival program's winning group, B.D.U. 

WaterFire's 1st single "Possible" embodies the vocal group's inspiring slogan, "We can be everything," and is a pop ballad number showcasing the vocal chemistry of the four members. 

Listen to WaterFire's 1st single, above. 

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