This course is based on the 64 hexagrams of the Book of Changes, and the Longxian Yi, which is exclusively understood by teacher Sun Chengde, is used as an idea to interpret the 64 hexagrams of the Book of Changes in detail. It contains knowledge about men, women, family, children, career, life and other aspects, allowing you to think and take action after reading. Make your life better, your career smoother, and your communication wider.