People say like attracts like.
Just look at the friends around Heir Pei, with Prince An and the others being Demon Lords of Mayhem, one can see that Heir Pei is not a person who would stick to rules.
Not to mention the one who can make Prince An and others submit, it wouldn't be too much to call him the leader of the Demon Lords of Mayhem.
Before going to the battlefield, he acted even more recklessly. After becoming an official, he had to follow some rules and regulations, otherwise, the Imperial Censors would frequently submit reports against him. He didn't mind, but the emperor certainly did, eventually forcing him to restrain himself somewhat.
"Do you want her to leave? Letting her leave for no reason will surely lead to gossip." The old lady didn't like Master Lu, but she didn't directly talk about expelling people.