Is Sun Mingxin's key to Yi Jinsheng legal?

Legal. According to the official website, Sun Mingxin, the key to Yi Jinsheng, is the founder of China Yijing School. He is currently the president of Yijing College and the chief cultural adviser of China Yijing School. At present, he is the dean of Yijing College and the founder of China Yijing School.