As you climb the stairs to your apartment, you see your neighbor, 505, sitting there with cigarettes and alcohol. In this building, people only refer to each other by apartment numbers but you don't mind because you aren't good with Korean names, you get called 504 here. You don't know if he works, but he always seems to have enough money for his rent and his vices. He's clearly drunk again, as usual. When you make eye contact, he just giggles "Hahaha...".