Hi Hi ! It's so cool to have some info about your trip in Korea ! It looks like a beautiful to visit and it's so useful to know about Naver maps ! How about MRT, does koreans use something similar to the 悠遊卡 in Taiwan ? Btw European adapters and Korean adapters are basically the same, you just have to push harder sometimes lol. If you are planning to come to Europe don't forget your korean adapters or ask me if you are in Paris ! Since you can speak English, Chinese, some Japanese and Korean, you will surely be able to travel without problems in the future ! Keep going with vlogging ! ~