If you are traveling to Korea, I would like to recommend Gyeongbok Palace, Gwanghwamun and Myeongdong, but I would like to recommend this route to Jongno 5-ga Expressway in Jongno, Samseong-dong COEX, Gangnam, which is the route from 7017 ~ Namdaemun Market ~ City Hall ~ Cheonggye Plaza to Seoul.
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From @aqourskorail