#1 JapanIf I have to choose one Country the answer is Japan with no doubt. It's almost 10 years that I discovered it and its culture and since then I kept leaning about it and I'm getting more and more attracted by it. I could talk about it for hours but it will be annoying for you so yeah I like Japan.
#2 South Korea
I don't really know if it's #2 or #3 but since it was the number 2 for the last years I've put it here. Sincerely I don't know so much about it, I listen to kpop music - I know that it might not be a right reason to go there - BUT I also watched a lot of videos of people who are living there so I learnt something, not as much as Japan tho.
#3 ChinaThis was the number 2 the first years, in fact I took Chinese lessons too, the teacher who is a real Chinese person taught me the language and the culture too. But for some years I didn't do anything, I started again this year, I took Chinese lessons - with the same teacher, how lucky I am! and I discovered some artists I like and I'm watching some Chinese drama.