On a rainy night, Su Mo, a heavily indebted takeaway rider, took an order to be delivered to "Ward 404, Building D, Qingshan Psychiatric Hospital" for a sky-high 588 yuan errand fee. Stepping into the depths of the hospital, which was as heavily guarded as a fortress, he discovered that the patients here were "abnormal" at all - the elegant uncle had a broken bronze chain wrapped around his wrist, and he was reciting the true name of the vicious beast from "The Classic of Mountains and Seas"; what was being held in the next room was actually "Xiang Liu", the nine-headed monster in mythology who caused a huge flood! When the terrifying containment breach alarm tore through the long night, the uncle who called himself the "Night Watchman" thrust a bowl of scalding hot spicy soup into his hand: "Newcomer, welcome! Now, pour it on the biggest snake's head!" The take-out box became a weapons arsenal, and the food delivery route became a path of survival. Su Mo was forced to perform "special delivery" tasks again and again as a mortal in this mental hospital where ancient horrors were imprisoned. Not only does he have to fight against the resurrected evil spirits, but he also has to uncover the shocking secrets hidden behind the "Green Mountain" about the resurgence of mythology and the end of mankind. This time, what he delivers is not only takeout, but also the last hope of human civilization.
