He has such a nice relationship with his eunuch! Really casual unlike how they're supposed to behave.
Usually the emperors second in command is his "milk brother" and they grow up together...
It's to make sure the bond is so close that the eunuch wouldn't even think of betraying him.
Oooooh! You learn something new everyday
I mean...
That's what they do in all the Chinese/Korean mangas
The emperor kills me