Uncle Yu had told Mu Huan that this alcohol was only strong alcohol. But in fact, there were additional ingredients in the alcohol. As long as Mu Huan drank it, she'd have nowhere to run. Tonight's matter would be settled.
The reason Mu Huan agreed to do it was because her hypnosis of Gu Chenyi was two-layered. The first level was easy to undo, but once someone undid his first level of hypnosis, it would stimulate his second level. That kind of hypnotic effect would be even stronger.
She had been so agitated earlier when she said that this was a clear loss. When she did not agree to the gamble, it was only to lure him into a trap. This was because she knew that Uncle Yu would definitely not sit back and do nothing after knowing that she had hypnotized Gu Chenyi. He would definitely do something.
It was obvious what he wanted to do and what he would do. Hence, she had made double preparations.
Hence, after her fake protest, she agreed.