When the warning of the old Indian turned into a blizzard of door-to-door closures that lasted for seven months, the residents of Silver Lake Town thought it was just another severe test of survival. It wasn't until someone violated the inexplicable rule of "no lighting alone on a snowy night" and disappeared mysteriously that they discovered to their horror that they were trapped in a snowstorm with "rules". Food crisis and supernatural threats ensue. Shen Han, a programmer by training, must rely on logic and code thinking to decipher the strange "laws of survival" that pervade the town; and his companions, the armed ranger Qin Muye and the meticulous female doctor Su Huaijing, must also show their talents. In the process of testing the boundaries of the rules with his life again and again, he changed from "observer" to "breaker", uncovering a shocking truth about "circulation" and "observation" behind this endless winter.
