Obviously, it was not that the Jade Emperor did not know Ying Zheng. He was just finding an excuse for his crime and pretending not to know him.
It was the same in this case. If the investigation continued, the Jade Emperor might find a scapegoat for himself.
If he did not investigate, Chen Xiaobei would have the chance to get the Ascension elixir that he had been dreaming of.
Chen Xiaobei had already seen through the whole thing, but he did not say it out loud.
The reason why Chen Xiaobei mentioned Ying Zheng's name was to remind the Jade Emperor that he had exchanged a poisonous pill for Ying Zheng's divine pill.
In other words, the immortal pill from back then had not been used.
The Jade Emperor would not simply throw away such an item. He would definitely keep it in his hands.
Although Chen Xiaobei had asked the Jade Emperor to look for it, there was a hidden meaning in his words. He wanted the Jade Emperor to hand over the elixir.