The doorway is not the doorway, and you will know it after you practice it. Daomen proves the Dao, and you can become a fairy. Whether you read it forward and reverse, read it forward and backward, read it forward and backward, read it left and right, read it inside and out, it is the door of the door! See how the male and female protagonists experience the ups and downs of the world, live through the shocking life in the world, and experience the taste of the people in the world in the overhead world where Taoism, Confucianism, Buddhism and Xuan are intertwined, and ancient sayings and modern sayings are intertwined. In the end, you can explore everything in the world and feel at ease!