The fantastical and magnificent city of Chang'an, a city woven with gears and mechanisms, is home to both humans and demons living side by side beneath its upturned eaves. Di Shao, a genius young man aspiring to become "Chang'an's Number One Detective," possesses exceptional crime-solving skills and a sharp tongue; while Asa, a rookie wolf demon constable, is formidable in martial arts yet kind-hearted. A bizarre murder case forces these two adversaries to team up, embarking on a hilarious and bickering detective journey. As clues point to the heart of the city, can this unreliable duo protect the joyful daily life of this fantastical city? And what earth-shattering secret lies hidden behind the bustling and prosperous Chang'an?

Following the excitement of first Bangkok and then New York, a big murder case takes place in Tokyo. Chinatown master detectives Tangren and Qinfeng are invited to take up the mystery. Adding to the excitement are the other detectives on the CRIMASTER international detective list as well as the current top rank, Q. Yet another hilarious battle of wits is set to take place...

2018 film by Chen Sicheng