"there is a legend in Greek mythology that human beings were originally androgynous, with two heads, four hands and four feet. However, Zeus, the god, was jealous of human happiness, so he split men and women with lightning. The Goddess of Destiny scattered the original pairs of men and women, making them forget each other. But the human mind still retains the feeling of the other half, so human beings rely on this feeling to find the other half in the world. Ye Jiajia (Tang Yi), the daughter of Ye Xiangxiang (Lin Xi pupil), hopes to find the footprints of her biological mother in the gorgeous and mysterious library of Mingxin Middle School. In a struggle against the demolition of the library building, which is of great historical and cultural value, the family unexpectedly met Chen Jiaqiang (Tan Yaowen), an apprentice of Gu Huasheng (Lin Wenlong). A series of sad and cruel truths happen occasionally in this library building. Every family reveals that their adoptive mother (Zhang Wenci) is the main accomplice who killed his mother's lover Gu Huasheng. The exchange of love and hate is on the trigger.