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Who is DK Yoo? When DK Yoo was 10 years old, he had a major surgery which resulted him getting sick often. So he trained in breathing techniques and meditation to overcome his sickness. Since then he has trained himself using different styles of martial arts, studied in various fields in philosophy and medical science. With his life experiences and knowledge, he came up with system called WCS “Warfare Combat System” which is the most ideal way for people to move and control their body and mind. With this system he has helped people find freedom in their mind and body.