Abstract: A refrigerator and an ice-making system thereof, which may maximize space utilization inside a storage compartment. To this end, an ice-making device is horizontally wide and vertically thin, and an ice discharge port of a dispenser unit is oriented obliquely or parallel to a surface of a storage compartment door to reduce the thickness of the dispenser unit. An icemaker and an ice storage container to receive ice made by the icemaker are horizontally arranged parallel to each other within the ice-making device. A transfer channel is formed in an inner foamed portion of the storage compartment door to maximize space utilization inside the storage compartment and door shelves.