Li Hongtao

High school sweethearts QiaoQiao and Li Xing are about to graduate from university and Li Xing surprises QiaoQiao with a marriage proposal. QiaoQiao, however, declines the proposal, offering rash arguments as to why he's not ready...

The subway train falls through the ground. The surviving passengers find themselves in the territory of a secret dungeon built by the Japanese during the war for scientific experiments.