The protagonist Su Tang is a doctor in a "24-hour pet hospital". This hospital looks ordinary, but it has a hidden service: treating "monster pets". Her notebook is full of strange medical records: "The fox of the fox demon family secretly drank human red wine, and all the fur on its tail turned pink." "The pet snake raised by the snake demon started to fall off because of a broken love and went on a hunger strike." "The pet of the tree spirit was fleshy. Because it was poured with 'demon world nutrient solution', it started to crawl around and bite people's shoes." Su Tang herself has the ability to talk to animals (including monster pets), which has been passed down from generation to generation in their family. "Talent".
Once, the wolf demon brought his "pet wolf" to see a doctor, saying that he had been "always irritable and tearing up the house". Through talking to the wolf, Su Tang found out that the wolf demon had recently made a human girlfriend and had no time to spend with it. It was "having a temper". In the end, Su Tang gave the wolf demon the following advice: "Take your girlfriend and your pet for a walk together, so that the pet knows that you are not left out."
The "treasure of the store" in the hospital is a cat named "Xiao Bai", who is actually a "cat fairy" who has lived for five hundred years. He usually sleeps at the front desk, but will take action when Su Tang is in trouble: for example, he secretly turns the "bad guy who wants to steal the monster pet" into "a mouse" and looks at Su Tang innocently: "It accidentally fell into the bucket and became like this."
