Seal of All Creations: I Set the Rules with the Order of the Underworld

I rented a cheap rental house and the landlord just gave me a piece of paper. It is filled with weird survival rules. I didn't take it seriously until the first person who broke the rules disappeared. This city has long been shrouded in mystery. If you follow the rules, you will not live; if you break the rules, you will die. In order to survive, I began to practice boxing skills that can fight against strange things. Not to become stronger, just to... Not be eaten.