what overnight are you talking about? it has been 52 chapters yet there's no even progress nor backstory at all. seungho's character is slowly descending into madness that discovering his feelings wouldn't even be enough as his redemption.
No he got manipulated by that prick and the way I said "overnight" it's a metaphor there are clearly some slight changes to seungho and can you change your personality quickly? No right? It's takes years to not do bad habits. Lets just wait and see what will happen if he truly didn't get any better then I'll hate him but have trust in him. I know that he'll get that character development soon.
Bruh character development cannot be done overnight. I know you guys want that I Do too but its seungho were talking about he got pride and the fact that he's a lord of course he's gonna be a dickhead at least there's some improvement he still discovered his feelings. So give him a break.