Three female college students are trapped in a remote homestay on a torrential rainy night. The female protagonist, Jiang Yao, receives an early warning through herself in the mirror ten years later, desperately stopping her best friend from opening the door to the human traffickers disguised to ask for help outside. Eventually, the three join forces to capture two criminals, and uncover that the mastermind behind the scenes turns out to be the best friend's boyfriend, Lu Zechuan, which further involves a startling case of the cross-province human trafficking syndicate Lao K.