Contrary to public belief, Seoul is not a very pricey city. I feel that there is so much to see and do in the city that won’t cost you an arm and leg.
In fact, you can see a lot of interesting stuff without costing you any penny.
Take a hike up the namsan walk to the N Seoul Tower and catch some of the free public demonstrations being held there.
I went to Seoul on a cold autumn day and I happen to catch a free traditional sword demonstration.
It was so cool and I hurt my hands applauding, hahahah.
See it for yourself.