Fan Xian knew the cause of Ye Qingmei's death.

Fan Xian looked through the case and the stone tablet to uncover the cause of Ye Qingmei's death. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei.

Fan Xian uncovered the cause of Ye Qingmei's death by looking through the case and the stone tablet. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei.

Fan Xian looked through the case and the stone tablet to uncover the cause of Ye Qingmei's death. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei.

Fan Xian uncovered the cause of Ye Qingmei's death by looking through the case and the stone tablet. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei. Ye Qingmei had threatened the interests of the old nobles in the Qing Kingdom's series of reforms. The Qing Emperor had also noticed her intentions and could not bear to let her shake the autocratic monarch. Thus, the Qing Emperor and the Temple jointly decided to kill Ye Qingmei. After Fan Xian learned of this truth, he was determined to avenge his mother and launched a soul-stirring contest with the Temple, the wealthy and noble families, Northern Qi, and other forces.

Fan Xian looked through the case and the stone tablet to uncover the cause of Ye Qingmei's death. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei. Ye Qingmei had threatened the interests of the old nobles in the Qing Kingdom's series of reforms. The Qing Emperor had also noticed her intentions and could not bear to let her shake the autocratic monarch. Thus, the Qing Emperor and the Temple jointly decided to kill Ye Qingmei.

Fan Xian uncovered the cause of Ye Qingmei's death by looking through the case and the stone tablet. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei. Ye Qingmei had threatened the interests of the old nobles in the Qing Kingdom's series of reforms, and the Qing Emperor felt the threat of her existence. Thus, the Qing Emperor decided to get rid of Ye Qingmei to protect his ruling position.

In the novel " Celebrating Years," Fan Xian knew that the cause of Ye Qingmei's death by the Qing Emperor was in chapter 221. Ye Qingmei had been plotted to be killed by the Qing Emperor. To protect his imperial power, the Qing Emperor had joined forces with the Empress Dowager, the Empress, and the Eldest Princess to attack Ye Qingmei.

Ye Qingmei's true cause of death was the Qing Emperor's scheme. The Qing Emperor chose to hide his identity and let others become the murderer. By adding fuel to the fire, the Qing Emperor made those who envied Ye Qingmei and feared her take action. The Qing Emperor's mother was also the first person to want Ye Qingmei dead. However, the search results did not provide specific details or evidence to support this answer. Therefore, regarding the cause of Ye Qingmei's death, the current search results could not give a definite answer.

Ye Qingmei's death was plotted by the Qing Emperor. In " Celebrating Years," the Qing Emperor transferred away everyone around Ye Qingmei, giving the Conservatives an opportunity to assassinate Ye Qingmei. Although the Qing Emperor later dealt with the assassins sent by the Conservatives, Ye Qingmei was already dead. The Qing Emperor chose to add fuel to the fire and let those who were jealous of Ye Qingmei and afraid of her take action. The Qing Emperor did not personally take action, but he was the biggest hand behind Ye Qingmei's death.

The details of Ye Qingmei's death and the identity of the murderer were not mentioned in the information provided. Therefore, it was currently impossible to know the cause of Ye Qingmei's death.