The detectives and trainee inspectors of Intelligence Department One, Group Seven, might still be in the dark.
At the time they wanted to show the new boss who's boss, Group Two, controlled by the Li Family in the same building, had already received a phone call from Li Yunshou himself, instructing them to fully cooperate with Qing Chen's work during this period.
If there was a conflict between their regular duties and Qing Chen's arrangements, Qing Chen's tasks could be given priority.
Once this was said, Li Yunqu realized the importance of the situation, which is why he met with Qing Chen as soon as he reported for duty.
Thus, for Qing Chen, he may not need to assert his authority; if detectives and trainee inspectors don't comply, naturally, there will be others who will.
If he really wanted to get something done, he could bypass Group Seven altogether.
He just didn't want to do that.