There was no information about the cause and details of the Third Prince's poisoning. Therefore, it was impossible to determine the exact cause of the Third Prince's poisoning.
The search results did not provide any relevant information about the cause and details of the Third Prince's poisoning, so they could not give a definite answer.
The Third Prince was poisoned because the Fourth Prince had given him a candy. However, there were also people who questioned this statement because some people claimed that the Third Prince did not eat the candy at all. Currently, the Third Prince was still unconscious and in a critical condition. As for the specific cause and details of the poisoning, the search results did not provide relevant information, so it was impossible to give a definite answer.
Guo Junwang knew about the poisoned wine because he was a meticulous person. He had already shown his observation and insight. In the Legend of Zhen Huan, Guo Junwang once asked Imperial Physician Wen to concoct a fake death medicine. This medicine later became the thing that kept him alive. When Zhen Huan appeared with a pot of poisoned wine, Guo Junwang saw that Zhen Huan's nature had changed through her behavior and actions. Therefore, Guo Junwang guessed Zhen Huan's intention. He deliberately asked Zhen Huan to close the window and took the opportunity to change the wine glass. Guo Junwang's action showed that he was aware of Zhen Huan's actions and knew which cup of wine was poisoned. Therefore, Guo Junwang knew about the poisoned wine and took action accordingly.
The Third Prince's final outcome was that Li Chengping became the new Emperor of the Qing Kingdom. After the Qing Emperor was killed by Fan Xian and Wu Zhu, the Qing Kingdom had no suitable candidate to inherit the throne. In the end, the ministers of the Qing Kingdom elected Li Chengping as the new Emperor. Even though Li Chengping did not have particularly outstanding talent, he succeeded in inheriting the throne.
The Third Prince's final outcome was that Li Chengping became the new Emperor of the Qing Kingdom. After the Qing Emperor was killed by Fan Xian and Wu Zhu, the Qing Kingdom had no suitable candidate to inherit the throne. In the end, the ministers of the Qing Kingdom elected Li Chengping as the new Emperor. Even though Li Chengping did not have particularly outstanding talent, he maintained a balance between the Crown Prince and the Second Prince and successfully ascended the throne.
In the middle of the year, the Third Prince married Ye Ling 'er.
In the middle of the year, the Third Prince married Ye Ling 'er.
The Third Prince of Qing Yu Nian ended up with Li Chengping successfully ascending the throne and becoming the new Emperor of Qing Kingdom. The Crown Prince was deposed and committed suicide after failing to rebel with the Eldest Princess. The Second Prince committed suicide after failing to assassinate the Emperor. In the plot, Fan Xian defeated the Qing Emperor and exposed the Qing Emperor's murderer. Fan Xian chose to return to Jiangnan and was not interested in the throne. He supported Li Chengping's succession to the throne.