If your into manhuas sissy is a good one although I don’t remember the plot that much I remember their was a really long groveling arc and their is also Stand-in Relationship.
If your not that into manhuas theirs a manhwa called banana scandal we’re in s2 it has a really good redemption arc even tho I think this one counts as popular if you haven’t read it pls give it a try.
And I also have one personal rec Fall in Love with the Substitute in which the mc does not get back together with the ml but gets with the person he was standing in for even tho it’s a bit cliche pls try it out if you liked the first two manhuas I recommend(it’s more of a turn your brain half off read.)
Sissy : https://www.mangago.me/read-manga/sissy/
Stand-in Relationship(mangogo does not have this so here’s the link to another website) : https://manhuahot.com/manga/stand-in-relationship-2/
Banana scandal: https: //www.mangago.me/read-manga/bbanana_scandal/
Fall in Love with the Substitute : https://www.mangago.me/read-manga/fall_in_love_with_the_substitute/
I hope this helps(づ￣ ³￣)づ
Rec me a good bl manhwa (not that popular) with good jealousy regretful arc