First, I want to talk about Seokeodang. Seokeodang is the place that has 2 floors. It also doesn't have Dangchung and Japsang which is on most of the buildings. It is because Seokeodang was the house for Wolsandaegun. After him, Inmok the queen was locked inside Seokeodang because of the order of King Gwanghaegun.
Second, I liked Jeonggwanheon, too. It is a interesting place because the western style of architecture and the Korean style of architecture were combined. You can find bricks, carpet, chandeliers and more. King Gojong used to drink coffee here.