This place is a must visit if you're in Jeju. We had a driver during our stay and he suggested visiting this museum. So glad we did! Start off with a short video of how the Japanese occupied Japan and then finish the tour with a walkthru of the underground tunnels that were built during the war. We met the founder (whose father was one of the Koreans involved in building the tunnel) who happened to be there and had a brief chat with him. It was an emotional experience. The museum seemed a little out of the way but it is definitely worth it.