Who says cats and mice can't be friends? Who says bad friends can't save the world together? In a modern world made up of many kinds of animals, Zhang Dawei (cat), an elite of the Animal Secret Service, meets Aqiu (rat), a useless tech geek, by chance. When the arrogant, hard-mouthed and soft-hearted Zhang Dawei meets the humorous, cute and loyal Aqiu, what funny and interesting stories will happen?