Seonangdang is a traditional Korean house that is super cool. It has a unique shape with a big round roof and lots of windows. It was built a long, long time ago by important people, like kings and rich people.
The round roof is special because it helps keep the house cool in summer and warm in winter. It's like a giant hat for the house! The windows also help with this by letting fresh air in and keeping the bad air out.
Inside the house, there are lots of rooms where the people who lived there could sleep, cook, and relax. There is even a special room called the "ondol room" where the floor is heated so it's warm and cozy for sleeping on.
Seonangdang houses are very important to Korean culture and are now protected by the government. People still love to visit and admire them today!