With the Alpha Childhood Friend I Despise

When Sia opens her eyes in the emergency room, she hears something unbelievable — after living her whole life as a Beta, her genetic type has suddenly changed… she’s now an Omega. And her lifelong rival, Jihoon, suddenly starts acting suspiciously. Their relationship takes a dark turn as long-buried tension, desire, and obsession come to the surface — forcing Sia to face a truth she never wanted to acknowledge. Source: MU