Is the existing Yijin Jing the only original in California? I heard that Yue Fei learned it himself in the Song Dynasty.
You can't say that. There are many versions of Yijinjing. Originally created by the founder of Dharma, later generations changed after learning. Of course, over time, there have been so many versions of evolution. Jin Shifu's Yijinjing can only say that his version is more authentic, and Jin Shifu may not be the most authentic. what do you think?