In a post-virus world with Alphas, Betas, and Omegas, Alpha Sheng Shaoyou seeks help from HS Group for his father's treatment. At the hospital, he meets Omega Hua Yong, who works for his competitor.

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Hua Yong reveals he's limited to intimacy with his marking Alpha, upsetting Sheng Shaoyou. Gao Tu struggles with hidden identity and pheromone issues, found by Shen Wenlang. X Holdings' push leads to business peak.

While seeking investors for drug research at a club, Sheng Shaoyou meets and helps Hua Yong, who needs money for his sister's medical care. Sheng secretly pays the bills, and they grow closer.

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 Yong go beyond friendship.

Gao Tu's suppressant abuse worsens his condition. As Sheng Shaoyou and Hua Yong grow closer, Sheng's marking proposal is rejected. Hua Yong disappears, and despite Sheng's search efforts, remains missing as his true identity emerges.