"No matter what I do, Han Wenxin just doesn't trust me. Look, even when I came to Linchuan Prefecture, Han Wenxin had to assign an Innate Sixth Realm master to monitor me," the Pharmacist lamented. The master from the Innate Sixth Realm was forcibly assigned to him by Han Wenxin under the pretext of his insufficient strength.
Even if he wanted to refuse, he found no reason to do so, especially considering he was just a Postnatal Third Realm profligate son a few months ago. Even if he had an epiphany and reformed, the Pharmacist couldn't instantly advance to the Innate Realm.
Like Feng Jiu, who was an exception, Qing Yu didn't want just anyone to become a Tribulation Slave. Although the "Black Heaven Book" offered many conveniences, Tribulation Slaves couldn't stay far from their Tribulation Master for long, which ultimately was a significant limitation.