New soft-square shaped robot cleaner deviates from the existing round shape and improves the cleaning performance for corners. With minimal design and seamless shape with digital bumper applied rather than the mechanical, it provides a durable image. Slide type mop board that enables replacement of mop without flipping the cleaner, accessing dust bin from top and larger relocated Start / Stop button increases the user convenience. Especially for the voice recognition model, the cleaner can be called to the current location of user along with the basic operation, removing the inconvenience of having to lift and move the robot cleaner.