The fight against the epidemic was thrilling. In 2020, Haijing was closed due to the epidemic. Cheng Yang, the owner of a deep breathing rehabilitation institution, continued to have a low fever after a kidney transplant, but he was still busy to find out the expiration of the donated masks and sneaked into the home of Mr. Fan, the owner of the pharmacy. Mr. Fan's nanny Ma Feiyan escaped from the hospital as a close contact. The attending physician Chen Yang also came to Mr. Fan's home to find her, but came up empty-handed. Cheng Yang, who was mistaken for a new crown patient because of his fever, experienced all kinds of thrilling moments. He accidentally uncovered the crime behind Mr. Fan's sale of expired masks and reunited with his ex-girlfriend Chen Yang. In the end, how will this farce caused by the epidemic and the entanglement of human nature end?