
i actually prefer not to recommend this because it has many trigger warnings and abuse sooo.. but if ur into psychological thrillers you can read but please read the tags or something first. Plus, this is not yaoi nor bl. I recommend Sign, Cherry Blossom After Winter, and Bj alex (though it was toxic at first but the ending is good).

(copied, some things dont relate to ur comment, im just too lazy to edit them out) killing stalking is not a yaoi. it is a physiological horror. there is no romance in it whatsoever. yoonbum does not love sangwoo. he believes he does because his idea of love is so twisted due to the immense amounts of traumatic experiences he's been through. sangwoo does not love yoonbum because he has a mother complex. he beats and abuses yoonbum because that's what his dad did to his mom. sangwoo manipulates yoonbum into thinking he cares for him, and that he's "special" because he did not kill him like he killed those women. but in reality, sangwoo is a sexist bastard. he hates women so much because his mother abused him, that is why he killed them but not yoonbum. another reason is that yoonbum is the perfect "target." he's mentally ill, which means it's easy for sangwoo to make him believe what he's doing is love. yoonbum has stockholm syndrome. koogi took the "bottom x top" trope and twisted it around. sangwoo is the "strong top" because he stays fit from beating and killing people. yoonbum is the "weak bottom" because he was malnourished as a kid and wasn't able to grow up properly. the amusement park scene was not there to make viewers rethink sangwoo and yoonbums relationship, it was there to further deepen the story. again, killing stalking is not a yaoi. people only think it is because of the crazed fujoshi fans that took over the fandom. please see killing stalking for what it was intended, not what you want it to be.
side note: most of the things i said were from this video please watch it, it's very informational: https://youtu.be/OjZKOeSQBSc
Is this a good yaoi to start with