This 4-way cassette deviates from the functional shape of commercial air conditioner and blends with the interior character. The user can select the grille that fits various environments rather than one typical grille. One panel type grille without front suction inlet provides clean image and lighting grille provides special atmosphere. The rounded edges of the air inlet area enable easy clean and each corner can be separated for easy installation. Such improved design aspects in the 4-way cassette design suggests better quality of the product itself.