兽医郝运（陈赫 饰）因为一场猫咪配种事故，意外发现这个世界上有转化者存在。动物管理局带走郝运，但用各种办法都无法洗掉他的记忆，只好迫使他加入动物管理局。从此郝运和战斗力超强的吴爱爱（王子文 饰）组成搭档，开始处理一桩桩动物案件......开启了一个巨大而神秘的都市精灵世界的故事。

獸醫郝運（陳赫飾）因為一場貓咪配種事故，意外發現這個世界上有轉化者存在。動物管理局帶走郝運，但用各種辦法都無法洗掉他的記憶，只好迫使他加入動物管理局。從此郝運和戰鬥力超強的吳愛愛（王子文飾）組成搭檔，開始處理一樁樁動物案件......開啟了一個巨大而神秘的都市精靈世界的故事。

Hao Yun, a vet at a private clinic, leads a mundane life until he accidentally discovers the world is inhabited by monsters. Worried about the secret of their existence leaking, monsters capture Hao Yun and attempt to erase his memories. When their attempts fail, Hao Yun is forced to join Monsters Bureau, where he solves cases involving monsters with the help of his new partner, Wu Aiai. As Hao Yun dives deeper into this new world, he learns that even monsters must deal with the mundane struggles of everyday life and the entanglements created by human emotion.