Yin-yang menu is a kind of cheating menu specially made by bad hotels, that is, when ordering food for customers, use the low-priced menu, while when paying the bill, settle the bill according to the high-priced menu. Many menus are loose-leaf pages inserted in plastic sleeves, and restaurants will randomly change menus according to the dishes ordered by tourists. These hotels are generally around tourist attractions. Many farmhouses have no names. A red plaque directly painted with "farmhouse meal" as a signboard. Its purpose is to hack you like this, and you have nothing to refute.