Jiang Xiaocong, who suffered a job scam during graduation season, chose to commit suicide on his birthday and was rescued by Xuan Mo, a cat demon who has been practicing for 990 years. The half-demon boy often shows his cat ears and tail due to his unstable transformation. In order to avoid debt collection agencies, Xiao Cong and Xuan Mo began to live in a shared apartment. Cat demons who don't know how to use modern equipment cause ulterior motives such as microwave ovens on mobile phones and filling flower pots with cat litter. During the day, Xuan Mo works as a lucky cat to attract wealth, and at night, he transforms into a mysterious fortune teller. He uses his demon power to help Xiao Cong outwit the agent, but his sudden appearance causes chaos in the cafe. In order to celebrate Xiao Cong's birthday, Xuan Mo secretly used his demonic power to turn into fireworks, causing him to be unable to transform for three days. Xiao Cong held the white cat and took care of it all night, and found that they had already connected with each other. Xuan Mo is about to face a thousand-year catastrophe. If he succeeds in overcoming the catastrophe, he will leave the world forever. The two made an agreement on the rooftop where they first met, but they didn't know that fate had already planted a turning point.
