As Wu Xiufan recovered from the poison, he began to investigate the attempted assassination. He knew that someone had tried to kill him, and he was determined to find out who it was.
He started by reviewing the surveillance footage from the banquet hall. He watched as guests arrived, mingled, and left. He paid close attention to the people who had come into contact with his wine.
He also interviewed the palace staff. He asked them if they had seen anything suspicious, if they had heard anything unusual.
But no matter how hard he tried, he could not find any evidence of a plot. It seemed as if the poison had been slipped into his wine without anyone noticing.
Wu Xiufan knew that this was not possible. The palace was heavily guarded, the surveillance was tight. There was no way that someone could have slipped poison into his wine without being caught.