With the recent emergence of a novel urban lifestyle that pursues “more frugal, better life,” the number of consumers who prefer smaller dwellings for one-person households has been rapidly increasing. They tend to opt for a place that not only satisfies their basic needs of life but is small, effective and stylish a concept best expressed in the phrase “Hidden Convergence and Merging into Interior”. Therefore, Daelim Dobidos has proposed an all-in-one eco lavatory system that meets these needs for small-sized bathroom, whose area is less than 1.8 x 1.6 m.