The story revolves around an seventeen-year old girl named Sandara Park who struggles the death of her mother and lost the will to walk. Sandara was so depressed to the point that she stopped going to school. Kang Seung Yoon, a classmate of Sandara, suffers from PTSD and recently broke up with his girlfriend, Son Na-eun. The story goes on as Kang Seung Yoon was appointed to tutor Sandara Park until she's willing to come back to school again.