1: Why did the crown prince know that it was Fu Rong who died and not the crown prince’s concubine? The reason is that there is a comparison between ancient and modern times. There is a correspondence between ancient times and modern times. In order to save the crown prince, Park Ha was driven into the river by Tae Moo. , just like the dead crown prince in ancient times who turned upside down in the river. The play also deliberately replayed the ancient crown prince's reaction when he first saw the crown prince's death, and the unhappy look on the crown prince's face when he went to save Park Ha. Believe it or not, when Park Ha needed a liver transplant due to a car accident, the crown prince went to Se Na and told her that she and Park Ha were sisters in the past life. Park Ha lost his life to save her in the past life. They all said that the crown prince already knew that those who died in ancient times were actually Furong, a comparison between ancient and modern times, the difference is that the ancient prince was stopped by people around him and did not go into the water personally like modern times, so the ancient prince had no chance to know the truth;

2: The specific investigation process ending It is not clearly expressed. It is speculated that because the modern crown prince already knows that it is Furong who died, the ancient and modern are corresponding. In ancient times, the crown prince's concubine was also a cruel woman. Furong would rather die to replace her sister. Then her family is behind the scenes. There must be an ulterior secret hidden;

3: Furong guessed the riddle in order to save the prince, and asked the prince to reward the persimmons that were poisoned by the prince's concubines. If Furong became poisoned in the palace because of this, If the Crown Prince dies, the Prince Concubine must be inseparable. Then the story of his family poisoning the Crown Prince may be exposed. If they exchange clothes and pretend that the Crown Prince accidentally falls into the water and dies while taking a walk, no one will be able to question the cause of the Crown Prince's death. Covering up the fact that Furong actually died of poisoning can protect the safety of the whole family. Furong in ancient times was pitiful. She had to save her beloved without harming her relatives. She couldn't have both love and family affection, so in the end she had no choice but to commit suicide to save both parties!