Girl, he's "reformed" because he's happy he had unconsenting sex with a sleeping person. Now I'm not a stickler for consent in a story but it is baffling how out of touch this webtoon is. The story's atmosphere doesn't match what's happening at all and it's downright creepy framing this as the happy after story.
Not to excuse it but if you really don't like "the way this story is going" - why did you guys pick it up in the first place? The very first scene in the very first chapter is the ML raping the MC whilst chained up. It's been very clear where this was going from day one. Could you not think "ahh maybe this isn't the story for me" 20 months ago?
And I just wanna be clear that it's ok to hate this story. It's okay to hate any story. But you really don't have to read things like this if they trigger you. There's plenty of yaoi out there to read instead that can spare your mental health. Don't force yourself to read things like this hoping it will get better because now you've spent years of your life on this and you're unhappy.