Qiao: Codenamed "Seven", he is an undercover cash card agent of the Intelligence Bureau. He collects evidence from various individuals who are suspected of violating laws and disciplines. After confirming the evidence, he arrests them and brings them back to the Intelligence Bureau.
Time: After retiring from the army, he interned at the police station and met "Lao Lu", the teacher who took him on as an intern.
Lu: Codenamed "Six", known to the public as "Lu Fangyan" and known as "Lao Lu", he is a former intelligence bureau gold medal undercover agent. In order to further help the organization fight crime, he joined the police station.
Concept: Gold medal undercover x retired police officer