Feng Ke Zhui --- Zhang Hao Wei
Feng Ke Zhui is Qu Sangeng's childhood friend. He is quick-witted, suave in his actions, and although well-read, he tends to deviate from conventional wisdom. Despite being a scholar, he leads a destitute life and often relies on his uncle, Wang Chong Li, for support. After his uncle is murdered, Feng Ke Zhui joins Qu Sangeng's detective team to seek revenge. He serves as the team's technical advisor, searching for clues in ancient texts, deciphering the messages left by the culprit, and providing psychological profiles to aid in solving the cases. He plays a crucial role in the investigation.
Qu San Geng --- Bai Yu Fan
He is a constable in Du County. Qu Sangeng has an outgoing personality, enjoys helping others, and possesses a strong sense of justice. His father passed away when he was very young, and his master, Leng Bu Tou, took care of their family and guided Qu Sangeng onto the path of being a constable. The master and disciple share a deep bond. After Leng Bu Tou is murdered, Qu Sangeng is determined to find the culprit and seek revenge for his master. During the investigation, he discovers a significant connection between his master's death and a massacre that occurred 20 years ago in the Lu family.
Song Chen --- Ning Li
Serving as an unqualified official.Song Chen has a gloomy and reclusive personality, harboring a deep resentment towards the world. In his youth, he possessed remarkable talent in both poetry and painting, with a bright future ahead. However, due to becoming entangled in court politics, he not only ended up imprisoned but also suffered a lifelong disability. He constantly wears gloves to conceal his crippled right hand. After surviving a near-death experience, his psyche became distorted, and he developed a twisted inclination to torture criminals during interrogations, often resorting to methods such as tooth extraction.
Leng Gui Er --- Xiang Han Zhi
Leng Bu Tou's daughter. Leng Gui'er is a strong-willed and determined individual, intelligent, kind-hearted, and empathetic. In order to seek revenge for her father and gather more clues about the suspects, she is willing to use the living expenses left by Leng Bu Tou, her father, as a reward. Upon discovering the stolen silver left by her father, she bravely admits that her father was a corrupt official. When confronted with Lin Siniang, her mother's romantic rival, she can openly express her feelings and, after learning the reasons behind the situation, chooses not to hold grudges. She even pays respects to Lin Siniang after her death.
Gao Shi Cong --- Liu Yi Tong
An unofficial worker in the government office. He is Qu Sangeng's good friend and partner. Gao Shicong is a simple and kind-hearted person, loyal and straightforward. Many times, he speaks without thinking, but surprisingly, his words often have a decisive effect. He comes from a family of butchers but chose to become a constable because he didn't want to slaughter pigs. Qu Sangeng has a conflict with the newly appointed Chief Constable, and Gao Shicong is worried that the Chief Constable will take personal revenge on him. However, he didn't expect that the Chief Constable found Qu Sangeng difficult to deal with, so he targeted Gao Shicong instead and dismissed him from his position.
Lin Si Niang --- Zeng Li
Lu Zhi --- Yu Yao
A servant in the Lu household. Personality traits: clever and quick-witted, good at reading people's words and expressions. Constantly hearing the address of "Young Master" has sparked improper thoughts in their mind.
Wei Zhi Xian --- Zong Jun Tao
The newly appointed county magistrate. Personality traits: appears to be a quirky and neurotic individual. When faced with difficult problems, he enjoys reporting to his superiors for instructions, but it seems that his real strength lies in pretending to be harmless while actually being cunning.
