If you're looking for manga similar to Keeper of the Pearl, you might like these titles.
20 year-old Hyesung Kim planned his entire life around the belief that he was an alpha, but when he goes into heat for the first time he learns to his horror that he is, in fact, a recessive omega. It's at this point he meets singer Dojin Park, a wealthy alpha who claims to hate omegas. Despite his words, Dojin finds himself musically inspired by Hyesung and driven by a strong urge to protect him. Hyesung also tries to deny their shared attraction, but their mutual hunger for each other drives them into each other's arms in spite of themselves. When their physical union results in a life-changing event, the two men's hot-and-cold relationship is put to the ultimate test.
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Both of these stories are omwgaberse couples that are antagonistic at first but are ultimately destined to be together
The most popular person on campus, a pretty face with smiling eyes, a friendly-yet-awkward classmate…that’s all Sung-yeon ever was to Hosik. But after a wild night out, Hosik awakes with zero memories of their time together - and one naked Sung-yeon in bed next to him! Hosik would have been fine with leaving their relationship as a drunken mistake on a night of many; but when he started feeling funny in the following days, a trip to the doctor’s office would change everything: “Mr. Kim Hosik, you’re pregnant!”
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Both are based on a couple from an older era with a tragic ending getting a second chance at love together. Also both have babies!!
The only difference is how possessive the ml is in Hosik's story (there is a noncon moment).
Hiroto, a college student, has memories of his “previous life”. He used to be the heir to the throne. He was deeply in love with a commoner man. Then, that day, their love was ruthlessly torn apart. Ever since he regained his memories, when he still was a child, Hiroto has been searching for his beloved Mika in this world. He vows that this time, they will find happiness together. Fate brings them together once again, but Mika’s reincarnation, Kou, has no memory of his previous life…
Alpha Tetsuji Takemoto was once a member of a well-known vigilante group, but has since reformed his ways and become a chef-in-training. Embarrassed by the fact that he suffers from erectile dysfunction, he's not good at dealing with omegas and tries to avoid them to keep from revealing his hidden shame. But when he rescues baby-faced salaryman Takumi Kaneda from being harrassed one night, he winds up with a cute omega admirer whether he wants one or not. His alpha instincts begin to awaken after he finds Kaneda in heat, but can Tetsuji overcome the past trauma holding him back and accept Kaneda's feelings for him?
Virgin omega Souchirou has no interest in sex or romance. A neat freak who shudders at the mere prospect of coming into contact with the bodily fluids of others, he has decided to forgo marriage and instead focus on his goal of becoming rich and entering the world of politics. But destiny has other plans in store for him when he goes into heat during a business trip and encounters his fated pair; a handsome foreigner who carries him off to bed for a night of exquisite pleasure. In the morning, the no longer virgin Souchirou awakens to find his new lover has disappeared; but he soon discovers that his mysterious paramour is actually... a king?!
Recessive alpha SeoWon is a scholarship student bogged down with a huge debt that he is struggling to pay off. He attends classes by day and works as a host in the evenings, and he's unwittingly attracted the attention of fellow college student HeeYeon, a dominant alpha who seems determined to make SeoWon his. When the handsome HeeYeon offers SeoWon a large sum of money to sleep with him, what will SeoWon do?
I had a one night stand with the first person I met, but I conceived a baby. Everytime this omega had a boyfriend, the relationship always ended up with being cheated and in the end, he even got kicked by hearing the words, “You are an omega, but I’m not attracted to you". Hae-soo, who was chugging alcohol while bursting out his anger at a friend who comforted him, get wasted by a drug, and to make matters worse, the heat cycle overlaps. Alpha Dogan, who was in the same pub, notices the condition of the Haesoo. Do-gun tries to help Hae-soo and get away from the place but he is tempted by Hae-soo and ends up spending the night together. In the morning, as soon as he wakes up, Hae-soo hastily ran away and finds out that he is pregnant 4 weeks later. Hae-soo decides to raise and make the child happy by himself. After 4 years, Hae-soo and Do-geon are reunited...