Crazy masks in the war against the epidemic

The fight against the epidemic is extremely 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. However, he still rushed to find out the expired donated masks and sneaked into the home of the drugstore owner Mr. Fan. 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 failed. Cheng Yang, who was mistaken for a COVID-19 patient because of his fever, experienced various thrilling moments and accidentally uncovered the crime behind Mr. Fan's selling of expired masks, and reunited with his ex-girlfriend Chen Yang. How will this farce caused by the entanglement between the epidemic and human nature end?