ABO Desire

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.

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.

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.

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.

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'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.

Hua Yong overdoses on pheromones and ends up hospitalized. Shen Wen Lang secretly visits him, but the meeting doesn't go well. After being discharged from the hospital, Sheng Shao You takes Hua Yong out for dinner and happens to meet Shen Wen Lang, where a conflict breaks out.

Sheng Shao You's condition worsens after losing control of his pheromones and gets hospitalized. X Holdings invites Sheng Shao You to a private gathering, but the effects of the pheromones cause him to fall into a coma which causes chaos.

Hiding the fact that he is an Omega, Gao Tu takes several days off work and avoids meeting anyone, which leads Shen Wenlang to mistakenly believe that he had another lover. Meanwhile, Sheng Shaoyou and Hua Yong finally enjoy a moment of sweetness after overcoming numerous obstacles, but an earthquake occurs. Hua Yong, in order to protect Sheng Shaoyou, unleashes an astonishing amount of power, causing Sheng Shaoyou to doubt whether he is really an Omega.

Sheng Shao You was kidnapped and injected with a deadly toxin. To save him, Hua Yong had no choice but to mark him permanently as Enigma. After the marking, the two become passionate and Shao You makes a confession. Meanwhile, Gao Tu makes a decision to resign, triggering misunderstanding and anger from Shen Wen Lang.

After Gao Tu confirms his pregnancy, he decides to resign and shoulder everything on his own. When Hua Yong confesses that he was Enigma and had been secretly in love with him for fifteen years, Sheng Shao You is shocked. Could Hua Yong's sincerity earn Sheng Shao You's trust?

The relationship between Sheng Shaoyou and Hua Yong heats up rapidly. However, Sheng Shaoyou's younger brother Sheng Shaoqing has ulterior motives which forces Hua Yong to protect his beloved.

Sheng Shao You and Hua Yong are both hospitalized. Hua Yong is seriously injured and in a coma yet he remains by Sheng Shao You's side. After several blood tests, Sheng Shao You is shocked to discover he's pregnant. Gao Tu insists on having the baby and cuts off contact with Shen Wen Lang, leaving Shen Wen Lang extremely anxious and finally confronting his feelings for Gao Tu.