When they were children, Yoon Na Moo and Gil Nak Won were each others first love. They are forced to break apart when Na Moo's father Yoon Hee Jae, a psychopath serial killer, murders Nak Won's parents.
Years later Yoon Na Moo is now Chae Do Jin, a passionate and kind rookie detective wishing to atone for his father's sins. And Gil Nak Won is now Han Jae Yi, an aspiring actress,like her mother before her, who suffers from a panic disorder but still has a good outlook on life. However, fate causes them to meet again. Will they be able to heal their emotional scars and finally live away from their mutually tragic past?