A refrigerator comprising a first storage compartment, a second storage compartment, a third storage compartment and an ice forming chamber, the refrigerator comprising: a four-way valve including an inlet through which refrigerant is introduced and a plurality of outlets (132, 133, 134) to discharge the refrigerant, and configured to open at least one of the plurality of outlets (132, 133, 134); the refrigerator comprises a first heat exchanger, a second heat exchanger, and a third heat exchanger, wherein the first heat exchanger is directly connected to a first outlet of the plurality of outlets (132, 133, 134) via a first refrigerant passage to adjust a temperature of the first storage compartment; the second heat exchanger is directly connected to a second outlet of the plurality of outlets (132, 133, 134) via a second refrigerant passage to adjust a temperature of the second storage compartment; characterized in that the refrigerator further comprises a fourth heat exchanger, and that the fourth heat exchanger is connected to the first heat exchanger via a fourth refrigerant passage to receive refrigerant from the first heat exchanger; the third heat exchanger is directly connected to the second heat exchanger and to a third outlet of the plurality of outlets (132, 133, 134), wherein a third refrigerant passage directly interconnects the third outlet and a fifth refrigerant passage, the fifth refrigerant passage directly interconnecting the second heat exchanger and the third heat exchanger to receive refrigerant from at least one of the second heat exchanger and the third outlet to adjust a temperature of the third storage compartment, and a sixth refrigerant passage directly interconnects the fourth refrigerant passage and a seventh refrigerant passage, the seventh refrigerant passage directly interconnecting the third heat exchanger and the fourth heat exchanger, the fourth heat exchanger exclusively receiving refrigerant via the seventh refrigerant passage. a four-way valve including an inlet through which refrigerant is introduced and a plurality of outlets (132, 133, 134) to discharge the refrigerant, and configured to open at least one of the plurality of outlets (132, 133, 134); the refrigerator comprises a first heat exchanger, a second heat exchanger, and a third heat exchanger, wherein the first heat exchanger is directly connected to a first outlet of the plurality of outlets (132, 133, 134) via a first refrigerant passage to adjust a temperature of the first storage compartment; the second heat exchanger is directly connected to a second outlet of the plurality of outlets (132, 133, 134) via a second refrigerant passage to adjust a temperature of the second storage compartment; characterized in that the refrigerator further comprises a fourth heat exchanger, and that the fourth heat exchanger is connected to the first heat exchanger via a fourth refrigerant passage to receive refrigerant from the first heat exchanger; the third heat exchanger is directly connected to the second heat exchanger and to a third outlet of the plurality of outlets (132, 133, 134), wherein a third refrigerant passage directly interconnects the third outlet and a fifth refrigerant passage, the fifth refrigerant passage directly interconnecting the second heat exchanger and the third heat exchanger to receive refrigerant from at least one of the second heat exchanger and the third outlet to adjust a temperature of the third storage compartment, and a sixth refrigerant passage directly interconnects the fourth refrigerant passage and a seventh refrigerant passage, the seventh refrigerant passage directly interconnecting the third heat exchanger and the fourth heat exchanger, the fourth heat exchanger exclusively receiving refrigerant via the seventh refrigerant passage.