Kwon Yuri, a once cheerful girl turns into a cold hearted person after her first love left her. Years past by, but she still can't get over him, she feels hurt and deep down inside she wants to know the reason he left her behind like that. Her best friends, Choi Minho and Im Yoona are the one that help her through her hard times. But as the time flies, she discovers a hidden secret and that changes her life. She also meets her first love, Lee Donghae at an accident