"There is a legend in Greek mythology that humans were originally androgynous, with two heads, four arms and four legs... However, Zeus, the god of heaven, was jealous of humans' happiness, so he used lightning to split men and women apart, and the goddess of fate scattered the original pairs of men and women to various places, making them forget each other. But the human heart still retains the feeling of the other half, so humans rely on this feeling to look for their other half in the world..." Yip Heung Heung's (played by Lin Xitong) daughter Yip Ka Ka (played by Tang Yi) hopes to find her biological mother's footprints in the gorgeous and mysterious library of Ming Xin Middle School. During a protest against the demolition of this library building with great historical and cultural value by a large group, Ka Ka unexpectedly met Chen Jiaqiang (played by Patrick Tam), the beloved disciple of Gu Huasheng (played by Lam Man Lung); a series of sad and cruel truths happened accidentally in this library building. Ka Ka revealed that her adoptive mother (played by Cheung Man-chi) was the main accomplice who killed her mother's lover Gu Huasheng! Love and hate are intertwined and ready to explode.