A refrigerator comprising: a cabinet; a refrigerator compartment disposed at the cabinet; a convertible compartment disposed at the cabinet, and the convertible compartment being capable of being set at a refrigerator temperature or a freezer temperature; an evaporator disposed in the convertible compartment; and a grill pan assembly disposed inside of the convertible compartment; wherein the grill pan assembly includes: an insulating structure having a convertible compartment channel and a refrigerator compartment channel, the convertible compartment channel at a first side of the insulating structure to supply cold air to the convertible compartment, and the refrigerator compartment channel at a second side of the insulating structure to supply cold air to the refrigerator compartment; a convertible compartment fan at the convertible compartment channel, and the convertible compartment fan to provide cold air from the evaporator to the convertible compartment channel; and characterized in that the grill pan assembly includes: a refrigerator compartment fan at the refrigerator compartment channel, and the refrigerator compartment fan to provide cold air from the evaporator to the refrigerator compartment channel, wherein the insulating structure includes an air guide opening to prevent air in the refrigerator compartment from flowing backward to the evaporator by allowing some air from the convertible compartment channel to flow into the refrigerator compartment channel when only the convertible compartment fan is to operate. a cabinet; a refrigerator compartment disposed at the cabinet; a convertible compartment disposed at the cabinet, and the convertible compartment being capable of being set at a refrigerator temperature or a freezer temperature; an evaporator disposed in the convertible compartment; and a grill pan assembly disposed inside of the convertible compartment; wherein the grill pan assembly includes: an insulating structure having a convertible compartment channel and a refrigerator compartment channel, the convertible compartment channel at a first side of the insulating structure to supply cold air to the convertible compartment, and the refrigerator compartment channel at a second side of the insulating structure to supply cold air to the refrigerator compartment; a convertible compartment fan at the convertible compartment channel, and the convertible compartment fan to provide cold air from the evaporator to the convertible compartment channel; and characterized in that the grill pan assembly includes: a refrigerator compartment fan at the refrigerator compartment channel, and the refrigerator compartment fan to provide cold air from the evaporator to the refrigerator compartment channel, wherein the insulating structure includes an air guide opening to prevent air in the refrigerator compartment from flowing backward to the evaporator by allowing some air from the convertible compartment channel to flow into the refrigerator compartment channel when only the convertible compartment fan is to operate. an insulating structure having a convertible compartment channel and a refrigerator compartment channel, the convertible compartment channel at a first side of the insulating structure to supply cold air to the convertible compartment, and the refrigerator compartment channel at a second side of the insulating structure to supply cold air to the refrigerator compartment; a convertible compartment fan at the convertible compartment channel, and the convertible compartment fan to provide cold air from the evaporator to the convertible compartment channel; and characterized in that the grill pan assembly includes: a refrigerator compartment fan at the refrigerator compartment channel, and the refrigerator compartment fan to provide cold air from the evaporator to the refrigerator compartment channel, wherein the insulating structure includes an air guide opening to prevent air in the refrigerator compartment from flowing backward to the evaporator by allowing some air from the convertible compartment channel to flow into the refrigerator compartment channel when only the convertible compartment fan is to operate. a refrigerator compartment fan at the refrigerator compartment channel, and the refrigerator compartment fan to provide cold air from the evaporator to the refrigerator compartment channel, wherein the insulating structure includes an air guide opening to prevent air in the refrigerator compartment from flowing backward to the evaporator by allowing some air from the convertible compartment channel to flow into the refrigerator compartment channel when only the convertible compartment fan is to operate.