21-Year-old Mu Yunyao bumped into her former junior high school classmate in a bookstore. This incident changed Mu Yunyao's character and life trajectory, and made Mu Yunyao the most difficult thing in Hou Xiaojun's life.
He taught her to grow up bit by bit and let her experience love and being loved. When they were about to get married, Mu Yunyao was kidnapped and disappeared for a year without a trace. When she came back, Mu Yunyao was suffering from severe depression. He failed to protect her because of the dual pressure of work and parents. She said, "Brother, I'm really not dirty. I'm really not dirty." In the endless belittlement and abuse, she finally chose to commit suicide by jumping off the building.