At twenty-one, Mu Yunyao collided with a former middle-school classmate in a bookstore. That encounter changed her personality and the course of her life, and made her the one regret Hou Xiaojun would carry for the rest of his life.
He taught her to grow, little by little, and let her experience loving and being loved. Just as they were about to walk down the aisle, Mu Yunyao was kidnapped and vanished without a trace for a year. When she finally returned, she was suffering from severe depression. Under the combined pressure of work and his parents, he had failed to protect her. She kept saying, "Brother, I really am not dirty. I'm really not dirty." After endless belittling and abuse, she finally chose to jump to her death.