Zao Hui is a cheerful, outgoing high school graduate from Xiangdao City. A graduation trip changes her fate: she, her best friend, her classmates, and the upperclassman she has secretly loved for years fall into an ancient tomb. When she wakes up in the city hospital, everyone else is dead except her and the upperclassman. Afterward, strange things keep happening to her.
Just as she agrees to be with the upperclassman, someone who should have died emerges from the darkness and appears before them. When the person threatens the pair and they refuse to comply, a vicious campaign of revenge begins.
A virus slowly consumes all of Xiangdao City. People are controlled in the dead of night and perish at dawn. Zao Hui and the upperclassman become the only ones who can save the city. From then on, Zao Hui's ordinary-girl image is transformed. The super bacteria inside her make her the savior of this small city, bringing it hope as well...
