Although he's not an official, he can impersonate one!
By impersonating Zhao Minghui, the captain of the criminal investigation team, Su Qing easily sent the people away, and he handled it just right.
He didn't impersonate Director Liu, firstly because the other party might not believe it, and secondly, being found out might not be good. On the contrary, impersonating Zhao Minghui as the captain of the criminal investigation team was just right. The position is important, and the authority he holds is not small. Most importantly, even if Zhao Minghui found out he was impersonated, he wouldn't say anything since he's someone who upholds the values of fairness and integrity.
Simply put, it was a makeshift strategy that temporarily alleviated Li Zijun's troubles.
