Because he was gay, Ku Yeil's childhood was nothing short of hell; he faced bullying at school and was treated like a mental patient at home. He didn't want to go to school. He hated the contemptuous gazes of his family, who looked at him as if he were a bug. One day, after enduring day by day, Yeil decided to run away from home to escape the unbearable pain. He had no place to rest his body or rely on for his heart. He wandered aimlessly through unfamiliar streets. Then, by chance, he saved a child who was about to get into a traffic accident. The child's name was Shin Yeoreum. She was an unfortunate child who had run away from home to escape domestic violence on the same day as Yeil. In the unfamiliar place and environment, the two met and spent a dreamlike day embracing each other's wounds, and Yeil and Yeoreum returned to their homes, cherishing the memories of just one day. Ten years later, Yeil and Yeoreum fatefully reunite at the same university.