Lovely! Actually I only went to Seoul since I just had enough days for a city break but was very fun, and still got to do some light hiking since Seoul is actually full of mountains! It's true what they say, everyone there looks amazing haha.
Oh no that is quite the stressful situation! Are you going to have to be the director still in the scenes you will now have to fill in for? I hope you can find a replacement in time! I'd do it if it were possible haha.