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In the near future, a virus has changed the sexual structure of humans, giving birth to a unique ABO system. Sheng Shaoyou, the young master of Shengfang Biology, is young and domineering, and is a top S+Alpha. Because his father is ill, he has to cooperate with Shen Wenlang, the boss of the rival HS Group. Sheng Shaoyou met the mysterious Omega Hua Yong in the hospital, and their feelings grew quietly. Unexpectedly, Sheng Shaoyou is mistaken for an Omega and becomes pregnant. Hua Yong's secrets are gradually revealed, and a brand new world opens up.
Hua Yong's true identity as the mastermind behind X Holdings is revealed. The misunderstandings between Shen Wenlang and Gao Tu deepen, and Gao Tu wants to resign. Sheng Shaoyou successfully brings Hua Yong back, and in order to protect him, he decides to go to war with HS Group.
Because of his abuse of suppressants, Gao Tu's pheromone disorder worsens. Meanwhile, Sheng Shaoyou and Hua Yong have reconciled and their relationship improves. When Hua Yong starts his rut, Sheng Shaoyou proposes permanent marking but gets rejected. Not long after, Hua Yong suddenly becomes unreachable. Sheng Shaoyou searches everywhere for him but to no avail, and Hua Yong's true identity is gradually revealed.
Hua Yong confesses that he could only have an intimate relationship with the Alpha who 'permanently marked' him, which Sheng Shaoyou finds unacceptable. On the other hand, Gao Tu faces the pain of hiding his identity and pheromone imbalance, which Shen Wenlang discovers. Meanwhile, X Holdings makes a push that brings the business developments to a climax.
The relationship between Hua Yong and Sheng Shaoyou deepens with various acts of service performed by Shaoyou, eventually turning into Hua Yong moving in. Shaoyou realizes that his feelings for Hua Young go beyond friendship.
In order to break through the bottleneck of targeted drug research and development, Sheng Shaoyou goes to his friend's private club, hoping to connect with the mysterious X Holdings, but unexpectedly meets and rescues Hua Yong. Knowing that Hua Yong is trying to cover his sister's medical expenses, Sheng Shaoyou secretly pays for them and the relationship between the two develops.
After a virus ravages the human population, a new hierarchy of sex categories emerges: Alphas, Betas and Omegas. Sheng Shaoyou, an S-level Alpha, seeks cooperation with the competitor HS Group for his father's illness, but encounters the mysterious Omega Hua Yong in the hospital, who deeply attracts him. Unexpectedly, Hua Yong is actually the secretary of Shen Wenlang of HS Group, and the struggle for secrets and power begins.