Just legal girl Mina, being dragged by her cousin, Momo and friend, Sana to a club when she just arrived at Korea to study there. And there she saw a really wasted girl, Nayeon who was about to be in a big trouble and Mina ended up decide to save the girl. Falling in love at the first sight she doesn't want to lose Nayeon as she know Nayeon was still in a relationship but in the verge of breaking up so she pretend to have done something with the wasted Nayeon who didn't remember anything and asked for a responsibility from her. Unfortunately turned out Nayeon, Sana and Momo knew each others. And that made Mina realized she got herself into a really big problem she couldn't run away from.