Zhou Peiyu is a poor junior at Jingyang University, abandoned by his divorced parents and forced to work part-time jobs to pay for tuition and living expenses. To earn quick money, he volunteers as a drug tester at the City First People’s Hospital, receiving an injection of an experimental antibody called “Mei Li Ting,” designed to provide immunity against syphilis. The payment is five thousand yuan, and he survives the trial with no immediate side effects.Returning to campus, Zhou Peiyu stumbles upon the school beauty Zhu Jiajia standing by the lake, preparing to jump. He stops her and learns she is being harassed by the wealthy playboy Yang Likai, who pursued her relentlessly and spread humiliating photos on the school forum. Yang Likai appears with his lackeys, but Zhou Peiyu fights him off and drags Zhu Jiajia to a cheap hotel outside the school to hide. Inside the room, Zhu Jiajia, desperate and afraid, seduces Zhou Peiyu and they spend the night together.The next morning, Zhu Jiajia collapses with severe symptoms: her skin is covered with red patches, and she has a high fever. Zhou Peiyu carries her to the campus clinic, where Dr. Park Chaeyoung, a brilliant medical professor, examines her. To her shock, Zhu Jiajia is suffering from stage three syphilis combined with a mutating hemolytic virus, a condition that should take years to develop but has erupted overnight. Zhou Peiyu’s blood is also tested, revealing that while he was infected with the same syphilis strain, the experimental antibodies from the drug test are actively killing the virus in his bloodstream. His blood acts as a natural antidote.Dr. Pu administers penicillin to suppress Zhu Jiajia’s condition, but the infection continues to worsen. That evening, Zhou Peiyu returns to the clinic to check on her only to find a commotion. Zhu Jiajia has awakened in a deranged state, physically attacking a female student and biting her neck in what appears to be cannibalism. Her body is now covered with swollen pustules leaking black pus, and she exudes a putrid stench. Dr. Pu screams that the syphilis has mutated into an extremely contagious strain, and direct contact is dangerous. Multiple students who were near her are already showing signs of illness.Zhou Peiyu’s unique immunity becomes crucial, but the situation spirals out of control as the infected Zhu Jiajia becomes a threat to the entire campus. His deskmate Li Wenli arrives at the clinic and witnesses the horror, as chaos erupts around them. The story follows Zhou Peiyu’s struggle to survive this outbreak while grappling with the consequences of his drug experiment and his unexpected role as the key to stopping the epidemic. The conflict between Yang Likai, Zhu Jiajia’s hidden secrets, and the rapid spread of the mutated disease force Zhou Peiyu to confront the dark realities behind the campus beauty’s fall and the dangerous biological weapon brewing within his own blood.
