Fifteen years ago, an accident forced Song Hao, an excellent high school student, to leave his hometown and his original life trajectory. Fifteen years later, he returned to his hometown and everything seemed to be calm. The reunion with his old classmate Pan Xiaoshuang brought him the long-lost light in his life. He decided to uncover the scar that he had not dared to touch for fifteen years, take control of his life again, and complete a seemingly impossible self-salvation.