In order to avenge his father, he decided to become an official in the palace and find evidence that could vindicate his father.
However, being an official is easy, but it is not so easy to investigate a case that has been under investigation for a long time. There is also a Minister of Punishment who is making things difficult for him at every turn.
"You want to investigate a case? Okay, I can still help you, but what do you want to give in return afterwards?"
"..." Still? Is this asking for favors?
"I don't need the money, and I'm even less likely to ask for your help in the future, but I don't want anyone to owe me money and not pay it back... How about I use your people to pay it back?"