During a fire, Li Heng and four others, including Tang Wanqing, Bu Yunxi, and An Ye, traveled to the city of time a hundred years ago at the same time. In order to find the entrance to the Time Tunnel, he encountered a series of fantastic events, and worked together with his friends in the City of Time to fight against the dark forces and defend the City of Time, which triggered a series of stories. (Part 1)