We are very sorry that your tour was not enjoyable.
First of all, the hot weather would have made it more difficult for you.
Also, we're sorry that we couldn't meet your expectations of the restaurant.
I'm sorry that the driver doesn't speak English well.
But, there are several things that must be made clear.
Your tour does not have a tour guide. We provide private vehicles with driver and tickets to get you safely to your destination.
I quote an introductory part of this tour.
'What's excluded'
-Tour guide
-Meals
-Gratuities(not compulsary)
-Overtime Charges 25.000krw/hr
the driver is literally a driver. If a driver acts as a tour guide, it is illegal in Korea.
and also, the restaurants around Nami Island are all for tourists. Because Nami Island is a tourist destination. Their services and quality are also almost identical.
A visit to the restaurant was not on the schedule.
It would have been better if you had chosen and instructed which places you wanted to go.