Kim Myungsoo is a hot kingka who's also known as a gangster from Infinite. He was once in love but then ever since his girlfriend Park Haeyeon passed away, he never thought of loving anyone again because he was afraid that if he love someone again, they might get involved in his gangster problems. And so, he promised Haerin not to love anyone again but then what happens if when the new student Park Jiyeon looks exactly like Haerin? Will he be able to keep his promise?