This appliance is a user-friendly product that maximizes the usage of space and improves user access. The InnerCase is a space for housewives who store food that are big in size for a long period of time. Food and beverages that are frequently used can be stored in the ShowCase, which is built separately so that family members can use it. This is an optimal design which is based on the concept of a “refrigerator inside a refrigerator”, reflecting the food types and usage patterns of the customers.