From the story unfinished business

You and Mino used to be friends in an orphanage before he ran away after getting adopted by a weird old man. At the orphanage he would get bullied for being a supposed omega. You would protect him since you were an alpha.

Years later he is a rich and powerful ceo of a company who’s now inventing a drug to convert alphas to omegas and omegas to betas. You were a mere gang leader yet he wanted to collaborate with you. As you both met up personally you fail to realize his goal was you. He stabs you with a needle and injects the new drug into you turning you into an omega.

He now vows to never let you go or leave him again. He admits he was never an omega but a dominant alpha but his traits were late.