I had possibility to visit one of them; the Friday night milonga organized by TangoBi.
This lady had the power over our music, loading energy to our feet!
As usual in Korea the community was friendly and talkative and easy going group of people. Cabeceos were clearly answered and the followers were waiting seated until you get there. Friends were behaving as friends are behaving all over the world and just asked for a dance after a chat.
Later in the evening a group of teachers and other organizers were joining the milonga and even there I got a few nice dances and a chat.
Some milongas in Busan