Under the city, strange things are rampant; no one can see the darkness in the world.
The Seventh Mental Rehabilitation Center in Lingcheng, on the surface, is an isolated lunatic asylum, but in fact it is a slaying stronghold where the Night Watch Division hides its remnants.
The patients here are not madmen, but guardians who have fought bloody battles with the strange and been seriously injured.
Shen Ci, a college student, was born with "spiritual eyes" and encountered a strange and soul-devouring truth. He was misdiagnosed and sent to the hospital. In this cage defined as "madness", he encounters the master of ancient spells pretending to be crazy and the former top combatant of sealed power, and reveals the shocking secret hidden deep in the hospital.
Seals are entangled, seals are loose, and weird things are counterattacking. When the darkness invisible to ordinary people envelopes the city, Shen Ci will take up the blade to cut off the evil spirits, using madness as a shield and the remaining soul as a spear, practicing killing techniques in the hospital to protect the lights of thousands of families.
"Don't be afraid, I am the night watchman."
Those "lunatics" who are misunderstood by the world are the last line of defense standing in the shadows to protect the world.
