According to her advice, we enjoyed Korean food, such as boiled chicken and カルグクス. Basically, the places we visited were decided by Aya, who got information from Japanese YouTuber, カオルちゃん.
I only had one request to visit the border between South Korea (Republic of Korea) and North Korea (Democratic People's Republic of Korea), which was accepted by her.
We were really impressed to see the reality of North Korea through binoculars from the observation point on the hill in South Korea. Some villagers were walking between the fields. Everything there was monotonous.
Seoul was a well-developed city, but was not as clean as I expected. To us, the capital looked a little bit dusty. I would say that I am not a big fan of Korean food, unchanged from my impression from my first trip to South Korea almost 30 years ago. It is true, however, that visiting foreign countries is the best way to realize the wonderfulness of our home country, Japan.