Jang Hyera is a simple 17 years old girl with a history of dark past of her own family that cause her to have a skeptical view of relationship. Things become complicated when she somehow has a crush toward her classmate, Kim Jongdae or prefer to be called as Chen. Due to the unbearable overflowing feeling toward the guy, Hyera try any alternative just in order to forget him. Little that she know, Chen is also trying to avoid his feeling for her as he thought the girl hate him. On one ordinary night, while walking back home, she met Kim Taehyung who was lying on the floor with scar and blood all over his body. She immediately went to the nearest store to buy antiseptic and blanket for the anonymous guy but as she returned to the place, the guy disappear. The next morning, the two bump into each other in front of the school gate.