Planning 9 days in South Korea in December (includes 2 intl travel days, so 7 days in country). I saw on social media someone recommended 2 days in Seoul, 2 days in Busan, and 4 days in Jeju Island. Curious who's been there and what you recommend. I like a mix of city and adventure travel. Hiking, good food, walkable/public transport, anything really unique to that region. Please send cities and any specific recs! #travel