Mockingbird, ch.1-11: a!Mei x o!Kei
Omega Kei has had it rough since he presented and eventually fell into a major gambling addiction that left him in debt to anyone that'd lend him money. When Mei, someone Kei thought was a beta throughout school, surfaces in his life, it's revealed that Mei was always an alpha who is the CEO of the casino Kei frequents... and is responsible for Kei's never ending losing streak.
Midnight Job, ch.12-22: a!Shi-woo (bottom) x o!Suh Hun-jung (top)
Alpha Shi-woo is a virgin. Embarrassing. But the cute new intern at his office is an omega and flooding him with pheromones, bingo! Only, Hun-jung is a top. Exclusively. And he's the chairman's son who's not afraid to blackmail Shi-woo into getting into bed with him.
Like A Tidal Wave, ch.23-43: a!Min Hae-il (bottom) x o!Suh-Lim (top)
Omega Suh-Lim is in possession of all the papers necessary to bring down his family company, but his eldest brother is holding illegal suppressants over his head which are the only things that let a dominant omega hide their dynamic. A "kidnapping" is staged and alpha Min Hae-il is in charge of watching Lim, only for Lim's suppressants to run out and for him to go into heat. With Hae-il watching over him.
Pheromone Shower - Omegaverse Short Stories