Synopsis：The fight against the epidemic was fraught with danger. In 2020, Haijing was locked down due to the pandemic. Cheng Yang, owner of the Shenhuxi Rehabilitation Center, had a persistent low-grade fever after a kidney transplant, but he was still busy investigating the expired donated masks. He sneaked into the home of Fan Zong, the pharmacy owner. Fan's maid, Ma Feiyan, who was a close contact, had escaped from the hospital. The attending physician, Chen Yang, came to Fan's home to find her, but missed her. Cheng Yang, mistaken for a COVID-19 patient because of his fever, went through many thrilling moments. By accident, he uncovered the crimes behind Fan Zong's sale of expired masks and reunited with his ex-girlfriend Chen Yang. How will this farce, triggered by the pandemic and human entanglements, finally end?