To make money and pay off her debts, Li Xijian agrees to impersonate Lin Yinyin, the woman Jiang Yan—the blind and powerful boss of Hong Kong Island—has always loved. But during their time together, she gradually develops feelings for him. When the real Lin Yinyin returns, Li Xijian takes the money and leaves, only to discover that she is pregnant. Five years later, in order to pay for treatment for her daughter Li Li, who has leukemia, Li Xijian returns to Hong Kong Island. While looking for a job, she unexpectedly reunites with Jiang Yan, whose eyesight has already recovered.

In an isolated village, two twins were born, separated by day and night. It is years later, and while the older brother Yuru has become a hunter of animals, his sister Asa has been locked away in a cage, ordered to perform a special duty that prohibits her from meeting more than a few select individuals. On an otherwise inconspicuous day, a group of armed men riding in helicopters, referred to as "dragons" by the citizens, assaults the village in search of Yuru, killing every adult on sight. When Yuru attempts to meet up with Asa and flee, he finds a dead body instead—on top of that, the person who killed her claims to be Yuru's true twin sister. Before the woman can capture him, Yuru is rescued by a man named Dera, an outsider who frequently visits the village. However, it is not long before the two are cornered. In a last-ditch effort, Dera makes Yuru give a gift to the deity of the village, summoning a pair of daemons whose existence is bound to reveal the truth behind these chaotic events.