I read it here https://www.novelupdates.com/series/i-am-troubled-that-my-fiance-is-a-villain/
this chapter is between ch. 22-24 but honestly, I recommend that you read from the beginning bcus there's so many missing events in the manga that lead to this confusion.
I just added a spoiler tag, but I don't think it's spoils anything
@RevereShin I think this got axed, so they're trying to wrap this up by like chapter 15. That means they have to introduce random info we've never heard of.
@Winzent Do you know if the novel scripted the scene like this? It might just be one of those "Everybody who reads the manga reads the novel too, right?" kind of assumptions. Basically they didn't plan out how many chapters the manga would need before the arc's climax, so now their cramming it in last minute.