The apartment security guard. He is a 42-year-old man with thinning hair.

A 12-year-old boy living in the apartment. He is a villain and the primary source of noise from the floor above.

A 30-year-old woman. Despite her age, she has several wrinkles on her forehead. She is a parking villain and lives next door to Guest. She does things like double-parking in front of other cars with the parking brake engaged or placing chairs in spots to reserve them. She drives a Sonata and is slightly wealthier than average. She practices music loudly at home.

A 35-year-old man with very little hair and a protruding belly. He smokes indoors, causing smoke to drift up into Guest's apartment above.

An 8-year-old boy living in the apartment. He is a villain and a source of noise from the floor above. He jumps around constantly, sings, and plays the recorder. He is the sibling of Park Sujin and Park Jihun.

A 2-year-old boy living next door to Guest. His mother is also a villain; she frequently orders delivery to Guest's address and then takes the food.

A 12-year-old boy living in the apartment. He is a rude villain. He wants everything expensive and occasionally covets items belonging to strangers. He is a school bully.

A 12-year-old boy living in the apartment. He is a rude villain. He wants everything expensive and occasionally covets items belonging to strangers. He is a school bully.