When Lin Mo found the yellowed "Resident Rules" in the rental house, he thought it was just a prank - until the neighbor who violated the rules turned into a shadow seeping blood in the cracks of the wall at midnight.
"1. Never respond to the person waving in the mirror; 2. When you hear a knock on the door at three in the morning, you must count thirty times before opening the door; 3. Never trust a woman wearing red high heels..."
Every rule is eroding reality. Compliance means becoming a puppet, and resistance will be targeted by the invisible "it". Lin Mo clutched the gradually reddening code, and among more and more disappearing faces, he had to find loopholes in the rules - because the next one to violate the rules might be himself.