Ray Ma said that Bai Er is the second level of Bai An, and Hong Er is the second level of Hong 'an. "Red case" mainly refers to the cooking categories of meat dishes, bowls and steamed bowls, including braised pork, crispy meat, honey sauce meat, rotten meat, ribs, meat and other dishes; "White case" means making pasta, rolling noodles, making pancakes and making snacks. These are the work scope of the "white case" master, and "white case" and "red case" are strictly separated.