9 Yum Jen Ging was created during the Sung Dynasty by an imperial official named Wong Seung.
9 Yeung Jen Ging's origin (as of the second edition of HEAVEN SWORD & DRAGON SABRE) is unknown, but it eventually ended up in the possession of the Shaolin Temple.
Qwai Fa Bo Deen was also created during the Sung Dynasty by an imperial eunuch, and was also later found in the possession of the Shaolin Temple.
Might there be some kind of connection among the three martial arts manuals, particularly 9 Yum Jen Ging and Qwai Fa Bo Deen as both of them emerged during the same general time period and both from officials in the Emperor's service?