Lol while rereading this, I realised, that in chap 21 Hyunwoo says he does not have any more condoms whereas in chap 20, when he asks youngwon to put on the condom, there are 2 more on the pillow lmao.
Basically just a post apocalyptic world in general. So mostly other people and raiders. The undead in the world don't eat people. They are just mindless walking corpses.
That jiggle caught me off guard haha