There's a pub that needs temporary managing, and Somin has decided that her younger sister's going to be the one to do it. Sohyun knows that working at a pub means surprising customers, but she doesn't expect to be surprised by the employees instead. And worst of all, the new performer is making her have feelings that have no business being there. Or do they?

Hyunwoo has recently been debuted as the leader of MonstaX. His fame and recognition has left him sedated until he meets the crazy "Mouse" (Mona Yeun). A tiny girl who packs a punch with monster like eating habits and the gift of not know who he is and the life he leads- The ordinary Mona has the attitude of an old person with eating habits of villagers but manages to be the only person Hyunwoo can breathe peacefully infront

 In where shownu's sister is really sick and a her very attractive best friend attracts his eye. Maybe he feels the same.