Sorry but hear me out.

Oh god long post. I get kind of frustrated with people saying this has ass characters/writing when it’s clearly an extremely well constructed toxic dynamic. Obviously to clarify I’m not out here saying what Wooyeon does Is Fine. He sucks, he’s arrogant, his mental illness does not excuse his actions because, contrary to popular opinion, those with ASPD/dark triad markers are actually more likely to manifest apathy towards others than outright sadism. It reads a lot more as an excuse for his shithead behaviour.
BUT… narratively there IS something compelling about a manipulative control freak who’s paying too much attention to his own puppet show to notice he’s falling in love simply because he underestimates his own capacity for sincerity. Likewise a protagonist too self-aware to outrun the horrible realisation he IS, actually, very capable of loving a man who has no problem hurting him and those around him… that’s sauce!!!
They are clearly not role models for an ideal relationship dynamic! They are being written, intentionally, as foil for one another in a broader narrative about the anxiety of falling in love. Wooyeon is on one side of the scale, he has an ice cold grip on his own emotions and observes himself from a distance, everything is deliberate, calculated, according to plan. Inseop is on the other, he cannot control what he feels, his feelings are a betrayal of what he knows is right, he cannot help but sabotage his own rationality because he’s in horrible, hateful love (he’s wilfully negligent, even).
When they are around one another, they destroy each other. Literally, yes, but also spiritually. Wooyeon finds there are facets within him that he didn’t know were there, a terrifying and rage-inducing feeling for someone who’s always had power over his own actions. Inseop realises he’s finding peace with the fact he loves a bastard, he manufactures self-loathing because he feels like he SHOULD hate himself for loving Wooyeon, that’s what a good person would feel. And if he doesn’t, if he actually genuinely is okay with loving this man, then what does that make him?
It’s total annihilation.
Some of the most interesting love stories are about destruction, about the upside-down feeling that you’re losing your grip on yourself, the awful and wonderful ways people will change you against your will, realising there are parts of you you never knew existed and maybe don’t like very much, about surrendering control and embracing oblivion. They’re not for everyone, they can be a tough read, but that doesn’t mean they’re not GOOD.