Some of controversy resulted from In Sun Seo’s book. Other from the fact that there was a fear of other people taking techniques they saw in Dr. He-Young Kimm’s book and incorporating them into their martial art. Some were not happy that techniques were shown up to 5th degree, and still more controversy from people seeing differences in the way the techniques are show in Dr. Kimm’s book, In Sun Seo’s book, and the way they were taught…… I’m sure there was more to this, but most of the people who were around during that time are reluctant to talk, In fact some instructors do not even want you to own a copy of Dr. Kimm’s book…… The techniques your KJN knows might be more closely related to In Sun Seo’s book since he trained in Korea, One thing to note is that Dr. Kimm’s book doesn’t show the forms in a step by step way. He only has a page describing the form. I think the intention was for the forms and kicking techniques to be in a second volume that was never printed. I wrote an email once to see if there was going to be a second book, but there was no plan at the time. His Kuk Sool book is like his other books, even without the forms detailed it is 760 pages. Originally published in 1978 (I think) In Sun Seo’s book started out with a lot of Korean, but every edition after that more English was used. By the 1987 edition all most all of the text is in English. The pictures of the techniques aren’t as good as the current textbooks or Dr. Kimm’s book, but the historical pictures in the front make this a good book to pick up for anyone involved in Kuk Sool Won. The title is Kuk Sool: Martial Arts Which Were Used to Defend the Korean Nation or more simply Kuk Sool. It’s getting tougher to find and if found you’ll most likely pay more than you did for Dr. Kimm’s book even tough it is only 250 pages +/- depending on the edition. The bio on his website is pretty complete, there have been others in magazines and some of his other books, but that one’s good. Everyone I’ve ever heard talk about Dr. Kimm has the utmost respect for him.