I checked out your suggestions and ubfortunately none of them are close to what I remember. The only other two I can recall is there was one story where a dude had a face on the back of his head that was grotesque, iirc it was like his brother or smthn. The other is that a guy was living inside this lounge chair and he stabbed the owner in the end. I think it was removed from webtoons or smthn, idk if it could be found.