An inexplicable phenomenon traps Li Shi Qing, a university student, in an endless time loop, where she is perpetually stuck on a public bus that is about to explode, bringing death and destruction not only to herself but to all the passengers on board. In a desperate attempt to find a way to escape not only the time loop but also her tragic fate, Shi Qing inadvertently drags her travelling companion, Xiao He Yun, into the time loop as well. Together, they try to find a way to alter their fate by ensuring the bus reaches its destination safely, but the task proves far from easy.