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.
Because chinese manhua don't get enough recognition or love compared to manhwa (korean) and manga (japanese), here my list of BL manhua.
This is a 3 parts list. Part 1 is composed of all the BL manhua above 9.2
Part 2: http://www.mangago.me/home/mangalist/1133383/
Part 3: https://www.mangago.me/home/mangalist/2520109/
Ranking
TOP 10 of my favorite manhua= page 1
9.8 & .7= pg 2
9.6= pg 2 - 3
9.5= pg 3 - 5
9.4= pg 5 - 9
9.3= pg 9 - 14
9.2= pg 14 - 18