Ming Shu handled Prince Nine in a quick and violent manner.
As for Prince Three and Prince Six, things didn't go as easily. They both suffered heavy losses as they fought for the throne. In the end, Prince Six won by a small margin.
Ming Shu felt that the emperor wanted to see his sons killing each other and he would let the person who won have the throne.
When the emperor saw Prince Six, he was not surprised at all. He seemed to have expected it.
Later on, Prince Six mentioned that he thought he hid really well but in actual fact, the emperor knew everything.
The first thing he did when he ascended the throne was to find highly skilled physicians and cooks from all around the world.
It was equally hard finding good cooks and good physicians.
Song Yunyan was really lucky too. Besides feeling uncomfortable occasionally, she lived quite well.
Ming Shu felt that it didn't matter if they cured her or not. Either way, she would not die.