Need historical toxic manhwa recs with actually well-written characters🫣

Looking for manhwa where the relationships are genuinely toxic but still make sense character-wise, not just drama for the sake of it.

I’m fine with manipulation, obsession, power imbalance, morally grey leads, all that, as long as the writing holds up and the characters feel real.

Any recs that aren’t surface-level toxic and actually stick with you? 🤔

Thanks in advance (⁠◔⁠‿⁠◔⁠)