I should have expected it but I am still suprised

EXACTLY !! this ain't a character development

Ur aware that that's his past life right ...

That's from the past life. And the current emperor himself was surprised to know what he has done before. Knowing the uke hates him for it, he decides to change. It's still character development if one changes for the better.

The emperor was willing to his own son and was killing his bed partners senselessly. He should be excused and forgiven just because he regrets hurting his lover when he ruined hundreds of lives?

Agree with you. I was so excited thinking that this story will be different from others. I still like this webtoon, but not too excited as before.

Well, the seme kind of did regret killing the others senselessly too. It's a subtle progression, since he is slowly learning little by little from the uke chastising him here & there. He is way more forgiving in the recent current lifetime compared to before he regained his memories, or his past life. This is a spoiler, but you'll see that in the end, he is also very merciful to the arch enemies. He could have done his worst, given that he was the target of the assassination attempt, plus that also put his beloved uke's life in grave danger too. But ultimately, he did not. Would that count as something?

Do bl fans love to rave in this self proclaimed righteousness .... ur aware it's a work of fiction and it's part of the story line , what do u want them to do lock him up in jail ..... even real life royals of this era in real life are just as bad even worse .

So yes even if he killed his sex partners in bed and tried to hit his son , it's gonna be excused cause that's what the plot says it will be . We all need to know how fiction works .

agreed.