1. Protagonist: Mao Genshun
- Identity: 30 years old, owner of "Genshun Style" barber shop in Changsha, skilled hairdresser, self-proclaimed "contemporary Di Renjie", with obsessive-compulsive-like logical thinking.
- Personality: He has a hilarious and venomous tongue. He likes to tell dirty jokes to coax guests. He is more serious than anyone else when it comes to cases. His logical deduction is extremely terrifying (he can deduce the height and weight of the murderer from a broken hair).
2. Supporting role: Niu Dazhuang
- Identity: Mao Genshun's roommate, a former weightlifter, powerful but simple-minded, responsible for "force value" and "funny responsibility".
3. Core villain: Lucky (a cat)
- Identity: Mao Genshun was a stray cat picked up while traveling in Fenghuang Ancient City. It was golden in color and had a broken copper coin hanging around its neck.
- Characteristics: He looks stupid, but he is actually a "highly intelligent criminal" who commits serial crimes.
