Blackwater Apartments

My name is Chen Mo, and strangely I inherited my parents' apartment. The price is that I fused a weird one. It hides under the skin during the day and moves on its own at night. It warded off disasters for him and guarded the dilapidated building for him - in exchange, it needed to eat. What does it eat? I don't want to know. I just knew I couldn't stop. The more tenants it has, the quieter it is; the quieter it is the safer I am.