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Online lecture information 031-712-3988 (https://blog.naver.com/airfry/2215901...) You can watch Kim Man-soo's 8th Dan's lectures more than 3 times a week, more than 90 minutes a week. I will point out the key points based on my experience teaching adults and children for more than 15 years. You can also watch the lectures on your mobile phone. Click https://www.airklass.com/page/270.