Former police officer Wang Ming-hao was trying to fulfill his friend's last wish, which was to run a pet shop after he died in the line of duty. However, due to his intimidating appearance, there were still no customers even a week after the opening. One day, he got tired and took a nap, and when he woke up, he had turned into a dog. After he turned into a dog, a strange boy appeared in front of him, and it turned out that the boy was a former stray dog ​​that his best friend had picked up. As strange events continued to occur, Wang Ming-hao enlisted the help of Li Taiyang, who had come for a part-time job interview, and together they searched for a way to return to his original state.