Unmei Ja Nai Hito
Omega goes into heat but the alpha he assumes is attacking him actually gives him a suppressant, and so he falls in love (might be fated pair?). He finds out that the company the alpha works for is an omega modeling company and decides to become talent
Moralless
tough translation but story seems interesting
Shinai Naru Omega e
Omega hides his gender from his new master since he hates omegas. And really people in general. But the omega finds that beneath his harsh exterior might be a soft center
I Found You, My Omega
Alpha finds an old potential marriage candidate that somehow rebels against his family (because not a rich submissive omega I think?) only to find that the small confidant and smart boy he knew is now very timid from years of bullying...
Romance, But Not Romantic
Kinda a hate to love scenario, omega does put money into a "hitman for hire" savings account when the alpha pisses him off. At a software company, Jinha is so stressed and overworked that he turns into a recessive omega from a beta. Now he has to figure out how to deal with his own pheromones and everyone else's too. And they all make him nauseous except for the team leader Cha's refreshing pine scent. So he starts leaning on him for help, even if before this he never liked the alpha much at all (see above hitman for hire).
Ai da, Koi dano Shouhosen