Wanzhang City is divided into an inner and an outer city. In the outer city, the youth Tong Yan harbors eight major masks: the Golden-Faced Old Man collects money for transactions, and the White-Faced Sang Biao takes lives in murder, navigating the dark zones by switching identities through masks. He depends on his blind younger sister, Tong Yan, and his sickly younger brother, Tong Wuji, believing that hiding deeply enough can keep his family safe. However, Tong Yan secretly mobilizes shadows to hunt down those who harmed her brother, while Tong Wuji uses apprenticeship as bait to drive evil ghosts into action. The masked youth's secrets and the dark sides of his younger siblings gradually collide, and their peaceful life is about to collapse.