This article is purely fictitious and may be misleading. Two parallel universes neither overlap nor intersect, just like the front and back of a piece of paper, connected but never connected. The gears of time are turning to 2016, and scientists at an institute unknown to the world are preparing to try the first experiment to communicate with a parallel world. Although the first experiment failed, scientific researchers discovered the secret of parallel worlds - each parallel universe should be independent of each other. However, because of this experiment, a channel between the two universes was inadvertently opened, and the two timelines began to slowly approach and gradually influence each other. Deng Lunhui and Ni Xiangfeng are ordinary little policemen in the main world. They met through an accident when they were in the police academy. When the world gradually begins to become chaotic, everyone is like a small piece of gravel in the torrent, small and fragile. Even if they struggle hard, they cannot escape the destined outcome...