Kyoung Ki and Master O are a "hidden gem" of martial arts in Novato/Marin County. If you are interested in training, for yourself or your family, you owe it to yourself to drop by and say hi. Master O has a remarkable depth of technical knowledge about TKD and BJJ, is a very talented instructor who is great with kids and adults alike, and who has high standards of ethical conduct. I have known Master O for over 30 years as both a fellow martial arts practitioner/instructor and, more recently, training with him as a student.