LIVE Watch our online seminars here. Upcoming Open Webinar in which master Ko Se-hwan will teach the basics of hankumdo. Starts on April 11 at 3PM CET. Previous streams Open webinar about nakbeop, hapkido falling techniques. Instructor Ko Sehwan demonstrates and explains hwansangdobeop and how to generate more impact. Instructor Klaas Barends explains the basics of hankido hwansangdobeop.