I would say maybe "It's My Baby!" and "Romance, But Not Romantic" have some similar elements to "Keeper of the Pearl". But if you want just omegaverse recs in general let me know :)
This manhwa's great, but I should've listened to my instincts and just picked this up when it's finished. Everything's just killing me, I'm dying to know what's going to happen next. ヽ(`Д´)ノ
SERIOUSLY
I really, REALLY liked the art style. But, this is just so frickin' messed up from whichever angle I look at it.
(And yet, I still finished it)( ̄∇ ̄")