What's the mystery behind Beidou Chess's decryption of the box that Cao Cao gave to Xun Yu?

Anyone who has read The Romance of the Three Kingdoms knows that Xun Yu was seriously ill and Cao Cao sent someone to send him a box. When Xun Yu opened it, it was empty, so he committed suicide. What's the mystery behind this? Why did Xun Yu choose to commit suicide when he saw this empty box?

According to the records in Wei Chunqiu, this has also been confirmed. The article said: "Mao was fed, drank empty, drank medicine, and died."

What do you mean by the empty box sent by Cao Cao? Why did Xun Yu commit suicide? In those days, Xun Yu assisted Cao Cao because Cao Cao was trying to save the Han Dynasty, so Xun Yu wholeheartedly assisted Cao Cao. But later, Cao Cao's ambition began to grow, and Xun Yu was still worried about the Han Dynasty, which is why Xun Yu finally broke with Cao Cao.

The difference between Xun Yu and Cao Cao began when Cao Cao wanted to seal Wang Wei.

As the only one who wanted to stop Cao Cao from sealing Wang Wei, Xun Yu was just too loyal to the Han Dynasty, but he didn't expect that all the people he helped were ambitious in the end. If Cao Cao really established the State of Wei and called himself Wang Wei, then the Han Dynasty would cease to exist, which is impossible for Xun Yu, a royalist.

But Cao Cao doesn't think so. He just thought it was disloyal and disloyal for Xun Yu to stop him. Since then, Cao Cao no longer reused Xun Yu, but transferred him from the power center, which fully expressed Cao Cao's dissatisfaction.

Xun Yu and Cao Cao were even hostile. When Xun Yu saw Cao Cao's empty box, he realized that he could no longer eat Cao Cao's salary. At the same time, Cao Cao also hinted that Xun Yu said that the number of Han people had been exhausted, so Xun Yu didn't want to violate his ideals and ambitions and chose to commit suicide to express his loyalty to the Han people.