Because the Old Minister was not in the capital and did not involve himself in court affairs, he refrained from using his contacts to gain favors, which meant that the Emperor had no reason to fear him either.
In fact, the Emperor not only held no fear of the Old Minister but also respected and admired him greatly. This sentiment was particularly strong because the Crown Prince had been personally taught by the Old Minister, which further enhanced his reputation.
Despite the existence of other brothers, none of them could find any way to discredit or cause trouble for the Old Minister. His reputation remained untarnished, maintaining a noble and pure image that only served to benefit the Crown Prince.
The Crown Prince found solace in the fact that the Old Minister's uninvolved nature was advantageous for him. He believed it was better for the Old Minister to maintain his distance from court affairs rather than seeking personal gain.