In the twelfth episode, the little boy was beaten by gangsters for interfering with playing cards. Gu Liang stopped the gangster, but the little boy was beaten all over with blood. Gu Liang called Wei Fengxiang and called an ambulance.

Chinese detective, alias Detective Gu Liang. Gu Liang, the instructor of the police officer university depicted in the play, is a senior detective with rich experience in solving crimes, and is called "detective". But at first glance, the detective is not as magical as the legend. He is plain, unkempt, humorous and likes to eat a few mouthfuls of delicious food. Take a break from time to time, find an opportunity to go around the classmates all over the country, show off your qualifications as an instructor, and taste the north-south flavor. Even willing to make a guest appearance in TV series to earn money for cigarettes and drinks. But perhaps because of the reputation of "detective", there are always cases crashing into his eyes wherever he goes, so he can't help but intervene in cases again and again, compete with young INTERPOL disciples, solve difficult cases one by one with meticulous reasoning logic, and laugh and curse, showing the true "detective" nature of a China policeman.