When Sia awakens in the emergency room, she hears something astonishing — after spending her entire life as a Beta, her genetic type has unexpectedly transformed… she is now an Omega. And her lifelong competitor, Jihoon, begins to behave in a strangely suspicious manner. Their dynamic shifts dramatically as long-repressed tension, desire, and obsession rise to the forefront — compelling Sia to confront a reality she had never wished to accept.