So... are you telling me the second prince betrayed his brother and wants the throne for h...

well, he did say he wants his mother to be empress again so i think he means by being the emperor and her mother being the Queen Mother (i think)

It's not that he wants the throne to himself, it's just that He wants the throne because that's the only way he can save his mother. He knows that his bro wont let her off once he is crowned emperor because of what she did to his mother and sister.

**for himself