Then and Now: Gatekeepers of Time

Do past, present and future exist at the same time? Three years ago, An Fantian's parents disappeared, leaving only a pocket watch of unknown origin. Three years later, on a meteor shower night, he rescued a girl from the claws of a monster. His pocket watch began to turn backwards. His future self borrowed his hand, and time stopped for three seconds, killing everything. Those monsters are called Xin beasts. Every Xin beast appearing in the present means that the door to the future is not guarded. He is the gatekeeper of time. He is not guarding the gate, but everyone's life.