OXO
Kwon Soo-Hyun, a promiscuous Omega, lives day to day, without a clear life plan. He lives a life of delinquency, using his innate (and demonic) talents for seduction and intimidation to approach and form relationships with Alphas according to their rut cycles, then exploit the "Omega Protection Act" to extort settlement money. Then one day, Soo-Hyun targets the seemingly wealthy Alpha Ryu Hyun. After a passionate night as usual, he blackmails him into paying him. But Hyun refuses and reveals the shocking truth: he's an Omega...
(Source: Lezhin, translated)