Synopsis：Shen Zhiwei fell in love with Fu Yunchuan at first sight, but because of her low self-esteem, she helped her best friend to pursue him. By chance, the two had sex, and Shen Zhiwei secretly gave birth to a daughter. They remained underground lovers for four years. After her best friend returned to China, misunderstandings arose, and the past was revealed. The two saw each other clearly, and Shen Zhiwei also solved the mystery of her life experience.