When seme (or male lead if it's shoujo/josei manga) regretting all the bad thing he has done (especially to his significant other) and trying to make amend of his wrongdoings. Some of the list has uke that is very forgiving, never forgive or died. I don't mind whichever ending, it's just the feeling of regret, from doing bad things or taking things for granted.
Most in the list are yaoi/shounen-ai genre, that's why I used term 'seme'. Feel free to add if you have anything similar in mind.
I didn't think this list would have so much followers. Thank you. For those who are asking if this list is active, yes its active. I'm just really picky.
What you'll basically see here:
Heroic Protagonist.
Trash Protagonist turned good.
Plain trash protagonist you can't help but like.
Villainous protagonist.
Cheat-like protagonist.
I'm biased with everything placed here since I read it all. I hope you like them too.
Credit to the original source.