
For a smartass who went through a lot planning everything, and even threatened an official to join forces with him killing the governor, Yeonjo was dumb this time, putting the poison somewhere easy to see. He could've carried it with him all the time, or buried it in the soil, idk. Seems like the author is running out of ideas for the angst. Also, he could've just run out to get the antidote himself, without saying anything suspicious to the guards. When he comes back, he could just say he was overly worried so he lost himself. I'm sure rhe governor wouldn't mind.