Mi Zong is a northern Chinese martial art that relies on deception and mobility rather than power to defeat an opponent. It draws on many aspects of the northern Shaolin Long Fist style, especially its emphasis on flexibility.
In Mortal Kombat
Mi Zong is used as secondary fighting style by Bo' Rai Cho in Mortal Kombat: Deadly Alliance and by Li Mei in Mortal Kombat: Deception and Unchained. It should be noted that in the story, Li Mei is trained by Bo' Rai Cho between Deadly Alliance and Deception, so it is possible that he's actually the one who taught her Mi Zong.