It was difficult for the Daxia royal family to have heirs. In Rong Yu's generation, he was the only one. The emperor's uncle wanted to make him the prince, but an imperial edict became a life-threatening talisman for the royal family...
Rong Yu: If you can kill anyone, it's one.
Jiran: I can save every one.
Rong Yu: The dead monk must be against me, right?
Motto: Good people are rewarded