We went in 2019 and it was amazing! You're going to have an absolutely fantastic time.
One of the highlights of our trip was a food tour. I can't recommend it highly enough - the food was great, of course, but also it got us into neighborhood places we certainly wouldn't have found on our own.
This is the company we used:
https://ongofood.com/
And be sure to go to the bathroom with windows in Seoul Tower. Definitely entertaining. (Granted, I had two tweens with me, so bathroom humor was very popular...)