Those Hidden Guards were unaware of the Old King's control by medication; they merely assumed his temper was poor and quick to change with age.
Thus, when they saw the Old King previously wanting to kill Chen Menglu, and now when Chen Menglu complained, the Old King angrily glaring at them, these Hidden Guards began to feel a subtle fear.
They believed that the Old King's treatment of Chen Menglu was akin to an ordinary grandfather's treatment of his granddaughter, where a few words of scolding sufficed when the granddaughter erred.
Once the granddaughter admitted her mistake, the grandfather stopped pursuing it, and the matter was over.
Therefore, having been slightly rough with Chen Menglu earlier, which led her to anger and complain, they assumed the Old King would be displeased, given his grandfatherly status towards Chen Menglu. He could punish Chen Menglu, but others could not.
