One thing i always do when im researching for activities in any city i visit, is to check for free walking tours. I’ve done free walking tours in Tokyo and Ho Chi Minh and have thoroughly enjoyed them. You get to meet some new people, get a guided tour with a local, and best of all, its free. Its also a good way to tick a lot of boxes of the list for tourist things in a short amount of time, so that you can spend more time doing the things you want.
In Seoul, i found this gem called Seoul City Walking Tours, an initiative organised by the Seoul government. A lot of the older residents of Seoul are the tour guides, as being retirees they have time on their hand. Many also speak Mandarin to cater to the flow of Chinese tourists. Of course english is well spoken by the guides also for the West.
There are a ridiculous number of free options for you to choose from, so many that you could basically use them to guide you all over the city
I opted for the night tour on a Friday after having worked from Mon-Thurs in the office. I was the only person on the tour, so it felt like a personalised tour actually! This was the description from the website, which sums it up best:
Walk along Seoullo while enjoying the fantastic night views of the city and learn about the history of Seoul Station. Seoul Station has been a fixture of the city for nearly a century, and it has had several names throughout the years. First it was known as Gyeongseong Station, then Seoul Station, and finally Culture Station Seoul 284. The tour will also proceed to Hanyangdoseong, the Seoul City Wall.
In particular the link below for the night tour