Her mother committed suicide by jumping off a building when she was four years old, and her father was a war correspondent who never returned home. Lin Xia was fostered in the home of her neighbor's brother Xiao Qi since she was a child. However, starting from her 19th birthday, Xiao Qi's girlfriend Zhu Jin attempted poisoning at the birthday party. Immediately afterwards, Zhu Jin committed suicide by jumping off a building in their school in the same way as Lin Xia's mother, and Lin Xia's ex-boyfriend Liang Jinming also attempted to commit violence against her. Xiao Qi himself is also trying his best to hide something. And this is just the beginning. Bizarre dreams, a boyfriend with a sudden change of personality, the reappearance of her mother's death, one murder after another and the woman calling her from the other side of the dream... Lin Xia gradually discovered the darkness hidden in the past, but does the face under the mask of a sinister smile really belong to the lingering undead?