In fact, Nangong Po was really overthinking things. Sun Wukong hadn't paid him any mind as a little character.
A character like Nangong Po poses no threat to Sun Wukong, and he had no reason to break the Inner Court's rules by taking Nangong Po's life.
Sun Wukong returned to the Holy Book Academy this time for the Divine Refining Tower.
"You want control of the Divine Refining Tower?"
Second Brother Ye Liangchen spat out his tea upon hearing Sun Wukong's request, eyes wide open looking at Sun Wukong.
"What do you want that thing for?"
"I, Old Sun, naturally have my purpose. Just borrowing the Divine Refining Tower for a bit won't be an issue."
Sun Wukong spoke ambiguously, he of course couldn't say he wanted control of the Divine Refining Tower to free the King of the Dark Night.
If he spoke those words, he could forget about obtaining the Divine Refining Tower.
"I can't make that decision. It needs Brother Zhong's approval."