Responses
What crossover? Is the psycho guy from another manhwa?
Yes "The Beast Must Die" by this author. It's so good! ヾ(☆▽☆)
Yup, the psycho guy was from "The beast must die".
Yeah.
The crossover is a pleasant surprise, and I'm gonba enjoy it. Additionally, I'm seeing some comments suggesting that Seonwoo to be a top (I also like to see that lol), but in the end, it is author story, and I think we should respect her decision.