Kim Sungmin and Kim Namjoon are twins. Kim Sungmin's stage name is Dance Monster. He wants to start a Kpop band. He had so many chances of being a solo artist. But, he chose to be in a band. Forwarding to five years, one afternoon, he gets kidnap. Police try to find him, they found no hope. Also, Kim Namjoon has a choice that can change his life forever.