Liyan literally means shining and radiant, but this time this brilliance is designed for the Liyan built-in touch flush tank for the Liyan built-in wall-hung toilet. Removing mechanical parts and using an electric mechanism, while making the operation process more beautiful and simpler, has minimized the possibility of problems in this structure. Because apart from the drain pump and electric keyboard and mechanical filling float, a plastic tank and a supporting metal structure, there is nothing to worry about. People who are interested in placing a luxurious and generous structure in their bathroom should place the metal structure and tank inside the wall when renovating or building a house and, by connecting a water inlet and an electrical wire as a standby after finishing the work by installing the keyboard and electrical appliances, perform the first water drainage test with just a flick of the wrist.