Omegaverse universe.

No one knew that the world legend Jay, the hunter ranked first among the strongest hunters, was an omega. Usually, the highest and strongest ranks went to the almighty alphas, the average betas, and the lowest and mostly useless ones to the omegas. But Jay was completely different from the omega that other people imagine. He was strong, secretive (as indicated by the full-face mask he wore all the time), hardy, with an average build and strong enough that many mistook him for an alpha, but with the absence of pronounced pheromones.

Lee Sayoung — an ambitious alpha and hunter who ranks second in the ranking, was in a fairly close relationship with Jay and was in his entourage almost all the time, stubbornly trying to figure out who he really belonged to. Alphas, betas, or omegas? His investigation stalled until Jay went into estrus, which could be indicated by a sudden change in his behavior.

– Are you all right? You've been acting weird lately. — Lee Sayoung remarked, concerned that hunter number one had abruptly started avoiding him.