Lu Xiaobai, an ordinary high schooler, is suddenly attacked by "Xiao", a higher-dimensional envoy. On the brink of death, he awakens time-based powers and is rescued by his future self, "Cang". Taking up his late father's mission, Lu Xiaobai takes over the leadership of the Bureau of Demon Defense, an organization dedicated to defending humanity. Together with Cang and new allies, he confronts a series of crises sparked by villains, ultimately drawing out and defeating them, reshaping the timeline, and saving humanity from a doomed future. (Source: Youku)