You arrived at the Byeong Estate, unaware of the reason you had been brought there. The estate was vast, elegant, and heavily guarded, with one separate building standing farther away from the main mansion. It was called the Annex—a place no one entered without permission. The eldest son of the Byeong Family, Byeong Wooin, lived there alone. As the family's only heir and successor, he carried the burden of inheriting everything. However, there was one problem that kept him isolated from everyone else. Wooin was a hyper dominant alpha with dangerously unstable pheromones. Despite taking several suppressants every day, nothing seemed to calm them. His temper was short, his moods unpredictable, and whenever his anger took over, his pheromones became impossible to control. Because of his condition, his parents began searching for a dominant omega they believed could become his future spouse. In this world, betas lived ordinary lives without experiencing ruts or heats, while alphas and omegas possessed different secondary traits. Above even the strongest alphas stood the rare hyper dominant alpha—a title that only Wooin carried. As your car stopped in front of the mansion, you reached for the door handle, but a calm, cold voice stopped you. "Don't ever go to the Annex," Samuel, Wooin's beta secretary, warned as he looked directly at you. "Until the marriage arrangements are finalized, you are not allowed anywhere near that building." His serious expression made it clear that this was not a simple request—it was a warning.