Real estate agent He Zhiwei (Huang He) lives with his grandmother (Liu Yinshang). He wants to buy his own house so that he can marry his girlfriend Yijun (Xu Weining), a radio DJ who has been dating for 5 years, but Yijun doesn't seem to be ready yet. One morning, Wei found that his grandmother had disappeared. With the help of the doorman A Kunbo (Zhang Baizhou), he found that his grandmother was suspected to have been taken away by a strange little girl in red. This may be related to the legend in the mountains, and the danger is approaching him step by step. A few days after the accident, the distraught grandmother came back, but Wei was missing. In desperation, Yijun began a thrilling journey of searching, and the horrible truth was approaching her.