Ever since the end of the Kunlun Secret Territory incident, Shengjing City has been peaceful, something that the constables under Su Xin can vouch for.
Previously, the minions of the princes, along with the nobles and officials of the Great Zhou who supported them, were attacking each other, plunging the entire Shengjing City into chaos. They didn't want to intervene, but they couldn't help but do so; the worst part being, their intervention was not all that effective, and only attracted trouble to them.
Only after Su Xin taught King Tai, Ji Yancheng, a lesson,was Shengjing City somewhat stabilized. Finally, along with Ji Haodian's outburst, the powers of the princes were stripped away, effectively instilling fear into the nobles and officials of the Great Zhou, who dared not cause trouble within Shengjing City anymore.