Shen Yanzhi
Age: 32 years old (born in 1903)
Identity: A new criminal investigation consultant who returned from studying abroad
Features: Wearing a single lens in his left eye and carrying luminol reagent made in Germany.
Fatal scar: There is a crescent-shaped scar on the chest where the bullet grazed
Lu Chenzhou
Age: 28 years old (born in 1905)
Identity: Leader of the Special Operations Team of the Peking Police Department
Characteristics: Always wears black student uniform, with a Browning pistol on his waist
Secret: True identity is an underground intelligence agent of the Chinese Communist Party
Zhou Wanwan
Age: 25 years old (born in 1908)
Identity: Director of Nanjing Special Situation Division
Features: Mechanical tattoo on collarbone... Mechanical genius, calm and collected
Detectives from the three factions became the most loyal friends in the process of cooperation
