Hard to say. A lot would depend on the themes, art style, and how well the relationship is portrayed in the manhwa. Sometimes it could be a yes, but other times, not so much.
The reason could be anything from a romantic encounter gone wrong to a mystery that needs solving. Maybe it's part of a larger conspiracy or just a random act that leads to unexpected developments in the story.
There could be multiple explanations. Maybe it's to protect someone or achieve a greater goal. Or perhaps there's a misunderstanding that's led him to act this way.
Yes. My Demon originated from a manhwa and has made certain changes to fit the medium of the adaptation. But the core elements and storylines are drawn from the manhwa source.
Here are some recommendations similar to toxic desire novels:
1. The Silent World was written by Lazy Blue Cat. It was a story about finding a way to survive in the doomsday wasteland.
2. The author imitated the Song Dynasty and told the story of a young man with peerless medical skills who struggled in the world of mortals.
These novels might be in line with your preference for toxic desire novels. I hope you will like them.