Omae no Koi wa Ore no Mono
Mochizuki is the omega captain of the judo club, who absolutely hates the alpha karate club captain, Ishio. But maybe all that energy isn't so bad, especially when Mochizuki teases Ishio with playful seduction (and it works) (the whole manga is them dating and being shy and cute)
Koi to Unmei no Sankaku
Kanata and Takeru are childhood friends and lovers. Because they are alpha and omega, they go to different schools. When their childhood friend Luca comes back as an alpha, Takeru falls into heat, and thinks lowly of himself for not having his heat with Kanata. Luckily, Luca has a solution: for all 3 of them to be mates!
Restless Webtoon
Hyeono is an alpha who was bullied in middle school, being mistaken for a rumored undercover omega. One of the lackeys, Gyojin, ends up working for Hyeono years later. Hyeono is angry with him, then starts to fall in love, then-- then Gyojin's narcissist ex joins the company.
Kurui Naku No Wa Boku No Ban
Takaba is an alpha who refuses to have sex with an omega, too traumatised from childhood memories of his father sleeping with different men every day as sex work. He meets Karasuma, an omega willing to sleep with anyone to climb the corporate later. But he's not quite what he seems
Romantic Joutou
Kei is an omega who wants to find a rich alpha to be spoiled by. His best friend (with benefits) Tsugitsugu is a beta, who might be in love with Kei despite his personality. But he thinks Kei should find an alpha, and everything goes wrong
Help Me, Teacher
Yoo Hanseul, a high school math teacher, finds out that hes an omega-- and with hyperactive pheromones at that. When he goes into heat at work, his coworker Yesung, who has been in unrequited love with him for 2 years, freaks out. But PE teacher Kwon has a different idea-- to have sex with Yoo.
Kyou Kara Omega ni Narimashita