"I will protect him. When that time comes, I will protect Jeong even if I have to give my life for it. No one, not even the King, will touch him as long as I am still standing."
Yu Yeong was startled by the firmness of this answer. From the young man's countenance and manner of speaking, he could be sure that Hyeon meant every word he just said. He would be willing to sacrifice everything in order to protect his little brother, even his own life.
What was Yu Yeong supposed to do in the face of such a relentless attitude? It wasn't like he could force either one of them to do as he wanted. He had no authority over them, and if even his father's help had been so easily dismissed, what could Yu Yeong possibly do more?
Therefore, Yu Yeong could only give up his expectations and accept his defeat.