It’s actually the effect of good narration and dialogue. We often encounter stories where authors just give generic motivations to the antagonist, slapping on labels like 'obsessive' or 'greedy.' As humans, we are wired to pay attention to stories of cause and effect. When you see his growth, his environment, and his relationships, it's natural to get interested in his story and even love how he's crafted.
At the end of the day, feeling fascinated by an irredeemable character isn't a moral failure; it's proof that the author succeeded in writing a living, breathing tragedy instead of a cheap 2D character.

I USUALY READ GREEN FLAGS MANHWA BUT I CAN'T EVEN EXPLAIN WHY I PREFER GUNNER...i feel like total shit for saying this but dylan and theo idk why feels so empity(DON'T GET ME WRONG I HATE IST)