He actually used a sneak attack

Xu Rouzhi looked at him with feigned shock: "Poisoned? Impossible, right? You clearly covered your nose and mouth just now! "

He frowned. "There are cracks on his fingers. How can he cover up that fine powder?"

Xu Rouzhi blinked her eyes, "Ah! I'm sorry, Your Highness! I know the method to cure the poison, but I haven't even had the time to develop the antidote yet! "

Chu Yixuan's gaze darkened. "Then why aren't you quickly developing the antidote?"

Xu Rouzhi blinked her innocent eyes, "Developing an antidote isn't something that can be done in a short period of time. From concocting the prescription to finding the ingredients to grinding and refining it, it would probably take at least two to three days! "Does Your Highness feel the urge to vomit, diarrhea, numbness in your limbs, and difficulty in breathing?"

Chu Yixuan was silent for a long time before he replied, "There is."