The Korean Cultural Center is located on Sukhumvit Road near Asoke BTS train station. We do have an interest in Korea so we went inside to browse around. The staff welcomed us and basically allowed us to wander around the two floors or the place. A lot of emphasis has been placed on the 2018 Winter Olympics and on the ground floor were backgrounds where you could pretend to be a jump skier or ice skater or speed skater and pose for a 3D photo.
Upstairs there was more information about the winter Olympics and some displays about the Winter Olympics and a cultural room with exhibits of typically Korean furniture, pottery and ceramics and musical instruments.
The whole visit lasted about 45 minutes because we had fun taking the pictures with the kids, but I think 20 - 30 minutes should be enough.