Hi there! :) It’s always nice to start out in Myeongdong because it has a little bit of everything. Personally, my favorite place (as in the books!) is Hongdae for the little cafés and the boutiques — I’m not sure if it’s still around but my favorite place to hang out is No Name café. Insadong is also a charming place! If you have time, try out the DMZ tour — it’s educational but also pretty cool. Enjoy your trip and have a great time!