What does the title ‘no littering’ have to do with this

I tried finding out , apparently back in the day littering was used as a word to describe giving a place to stay for a group of animals but I don't know how it applies here? Maybe no place to stay?

Or maybe he's garbage cause they called him a scumbag like 3 times or so in the first 1-3 chapters right , so maybe the ml thinking he was going to get murdered = garbage disposal

Basically, Kwon Jihyeok is the animal.
I’m guessing it’s a metaphor