Responses
I love your approach and your wise investigative mind, but alas, I'm worried this is a case of "We had to buy premade 3d sets, and this one's got wine in it".
I don't know, for someone who doesn't drink alcohol, he has too much of it in his house. The rest of the townspeople avoid him because they are afraid of him, so why keep it?
Guwon doesn't drink alcohol, but in chapter 5 in the kitchen, when he offers the teacher alcohol, there are 2 bottles of wine and two glasses on the counter behind him. One of the glasses is full. Remnants of the previous guest or is he lying about not drinking alcohol?