The Qing Emperor knew that after Fan Xian died,

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. After Ye Qingmei died, the Qing Emperor decided to let the Crown Prince succeed the throne. Fan Xian was sent to Danzhou to be raised.

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. After Ye Qingmei died, the Qing Emperor decided to let the Crown Prince succeed the throne. Fan Xian was sent to Danzhou to be raised. Fan Xian later succeeded in killing the Emperor. The Qing Emperor knew of Fan Xian's death.

The Qing Emperor knew that after Fan Xian died.

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. After Ye Qingmei died, the Qing Emperor decided to let the Crown Prince succeed the throne. Fan Xian was sent to Danzhou to be raised. Thus, the Qing Emperor knew that after Fan Xian died.

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. After Ye Qingmei died, the Qing Emperor decided to let the Crown Prince succeed the throne. Fan Xian was sent to Danzhou to be raised. Thus, the Qing Emperor knew that after Fan Xian died.

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. After Ye Qingmei died, the Qing Emperor decided to let the Crown Prince succeed the throne. Fan Xian was sent to Danzhou to be raised.

In " Celebrating Years," the Qing Emperor had always known that Fan Xian was his son. Even though the Qing Emperor had wanted to kill Fan Xian before he was born, Fan Jian had used his own son to replace Fan Xian, allowing him to survive. Through his investigation and Ye Qingmei's letters, Fan Xian gradually revealed the mystery of his birth and learned that the Qing Emperor was his biological father. However, there was no clear answer in the search results regarding whether Fan Xian knew about the Qing Emperor's death. Therefore, based on the information provided, it was impossible to determine whether Fan Xian knew about the situation after the Qing Emperor's death.

In " Celebrating Years," the Qing Emperor knew about Fan Xian's past. The Qing Emperor had always known that Fan Xian was the illegitimate child of Ye Qingmei and him and had paid close attention to his growth. However, before discovering that the Crown Prince and Eldest Princess had an unethical relationship, the Qing Emperor still firmly nurtured the Crown Prince as his successor. The reason was that the Crown Prince had a warm personality and would not threaten the Qing Emperor's rule. Moreover, he was suitable to be the ruler of the city. The Qing Emperor was prepared to unify the world, so he had to give full power to one person. The Crown Prince candidate could not be too strong. In addition, the Qing Emperor was worried that Fan Xian would be like Ye Qingmei, who went against the orthodoxy, so he did not have much hope for this illegitimate child. Thus, the Qing Emperor knew Fan Xian's identity.

In " Celebrating Years," the Qing Emperor had long known of Fan Xian's background and paid close attention to his growth. Fan Xian had transmigrated to the Qing Kingdom from the modern world, and the Qing Emperor had set up a trap to make Xiao En think that Fan Xian was his grandson. His goal was to get the secret of the Temple out of Xiao En's mouth. Although Fan Xian's true identity had not been publicly acknowledged by the Qing Emperor, he had always known that Fan Xian was a modern man. Thus, the Qing Emperor knew that Fan Xian was a transmigrator.

In " Celebrating Years," the Qing Emperor had long known of Fan Xian's background and paid close attention to his growth. Fan Xian had transmigrated to the Qing Kingdom from the modern world, and the Qing Emperor had set up a trap to make Xiao En think that Fan Xian was his grandson. His goal was to get the secret of the Temple out of Xiao En's mouth. Although Fan Xian's true identity had not been publicly acknowledged by the Qing Emperor, he had always known that Fan Xian was a modern man. Thus, the Qing Emperor knew that Fan Xian was a transmigrator.