I wish I could tell you more about these cards. Unfortunately, the writing in English doesn't tell me much, and I don't read Korean. If you have some insight, please leave a comment.
The first card shows a pagoda on top of the Keiron. I couldn't seem to find any information on what the Keiron is. There's something very beautiful and mysterious about the card though, so that's why I'm posting it.
Here's a close-up of the people. The variety of hats is particularly interesting.
And here's a picture of a village - but where? I wonder what it looks like now. Is it Yangdong Village? If so, it looks a little different today.
I'd love to be able to wander in for a closer look. Here's a little close-up, showing some people in the village. I'd also love to know more about the building materials. The roofs appear to be straw thatch and the houses may be constructed of mud bricks.
Finally, we have a card showing Prince Li's Palace in Seoul. I don't find anything under Prince Li's Palace either, although there are several palaces in Seoul.
The back of the cards all look like this.