Game designer Xiao He Yun and university student Li Shi Qing are caught in a time loop after a bus explosion and must work hard to put a stop to it. Xiao He Yun and Li Shi Qing are two ordinary people forced to fight for their lives repeatedly following a bizarre cycle that occurred after a bus explosion. The passengers have different identities and experiences, they have their difficulties and their own expectations for the future. The truth is hidden in layers of mist, but justice will ultimately prevail.