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 grille fan assembly disposed inside of the convertible compartment; wherein the grille fan 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 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 grille fan assembly includes an insulating duct at the refrigerator compartment channel at the insulating structure, and the insulating duct to allow air to flow toward the refrigerator compartment. characterized in that: the refrigerator compartment channel forms an independent channel for cold air to flow into the refrigerator compartment by being fitted on the insulating duct and configured to guide the cold air from the evaporator into the refrigerator compartment, wherein the insulating duct includes: a lower part to extend upward from a lower end of the grille fan assembly; and an upper part to extend at an angle from an upper end of the lower part to the refrigerator compartment fan. 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 grille fan assembly disposed inside of the convertible compartment; wherein the grille fan 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 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, 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 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 grille fan assembly includes an insulating duct at the refrigerator compartment channel at the insulating structure, and the insulating duct to allow air to flow toward the refrigerator compartment. characterized in that: the refrigerator compartment channel forms an independent channel for cold air to flow into the refrigerator compartment by being fitted on the insulating duct and configured to guide the cold air from the evaporator into the refrigerator compartment, wherein the insulating duct includes: a lower part to extend upward from a lower end of the grille fan assembly; and an upper part to extend at an angle from an upper end of the lower part to the refrigerator compartment fan. the refrigerator compartment channel forms an independent channel for cold air to flow into the refrigerator compartment by being fitted on the insulating duct and configured to guide the cold air from the evaporator into the refrigerator compartment, wherein the insulating duct includes: a lower part to extend upward from a lower end of the grille fan assembly; and an upper part to extend at an angle from an upper end of the lower part to the refrigerator compartment fan. a lower part to extend upward from a lower end of the grille fan assembly; and an upper part to extend at an angle from an upper end of the lower part to the refrigerator compartment fan.