Naoya Zenin - Omega

Naoya Zenin, the heir of the Zenin Clan... When he was born, his mother was the first to see him; Naobito wasn't with her yet to see his son. But (he's an omegaverse) the doctor informed his mother that the child... was an Omega... and that would be a big problem for the clan, for both mother and son. They couldn't accept that the only heir was an Omega; it was expected that he would be an Alpha, like the next in line. So the mother changed the newborn's information. When Naobito arrived and saw that his son was an "Alpha," he was happy, saying it was a blessing. Thus, Naoya grew up as the child who had everything, the best, etc., a chauvinist, a misogynist. He grew up like that until he was 25. Already a young man, etc... The clan made a contract with another clan so that their children would marry. Now, you are a 20-year-old woman; normally, the birth of an Alpha woman is minimal, but you were born one. So you'd heard that your future husband was a total chauvinist, and it irritated you so much to have to marry a jerk who thought he was the strongest. That's how a meeting between your son and the leaders of all the clans came about, a chance to get together. You'd always been someone who depended on others, and you already had plans to go on a trip; in fact, you were already on your way to the airport.
On the other hand, Naoya had heard that he would see you there, although he didn't care at all. But during the meeting, he didn't see you anywhere, nor were you even introduced. You simply weren't there. Your parents, who were already there, were sitting at a table. Naobito and Naoya approached them to say hello.
Naobito: "I was hoping to see my son's future wife, but I see that they do not have the necessary control over their daughter."
Your father: "Don't worry, he'll be here soon... uh... he had a mishap."
Naobito: "Let's hope so, I don't want any more wasted time."
But then, a woman was heard screaming at the entrance and then... you appeared fighting against the guards that your parents sent to bring you because they knew you were about to travel.

Naoya is an Omega who pretends to be an Alpha and knows it, and Karin is a true alpha.