Killing Stalking
Boy is this messed up, The horror is absolutely terrifying and made me feel dizzy at points. The characters, specifically Sangwoo, the serial killer, and Bum, the perverted stalker that is spared.... as far as being killed anyway. The plot is full of abuse, murder, and so much more chilling elements. I would not recommend this to someone hoping for a yaoi love story. Sure the two care for each other in their own way but it is twisted, toxic, abusive, and pretty much the perfect example of Stockholm syndrome. But if you enjoy all things horror and terror, gore, psychological, and digging into the mind of serial killers here you go. The creator managed to make complicated characters that I found myself feeling bad for, like Sangwoo and Bum during their childhood. It really drives home the point of you that evil is not born, it is made.
Hyperventilation