A refrigerator comprising: a storage chamber configured to store food; a cooler configured to supply cold air into the storage chamber; a first temperature sensor configured to sense a temperature within the storage chamber; a first tray assembly configured to define one portion of an ice making cell that is a space in which water is phase-changed into ice by the cold air, a second tray assembly configured to define the other portion of the ice making cell, the second tray assembly being connected to a driver to contact the first tray assembly in an ice making process and to be spaced apart from at least a portion of the first tray assembly in an ice separation process; a water supply part configured to supply the water into the ice making cell; a second temperature sensor configured to sense a temperature of the water or the ice within the ice making cell; a heater disposed adjacent to the first tray assembly; an additional heater disposed adjacent to the second tray assembly; and a controller configured to control the cooler, the second tray assembly, the heater and the driver; wherein the controller is configured to control the cooler so that the cold air is supplied to the ice making cell after the second tray assembly moves to an ice making position when the water is completely supplied to the ice making cell; wherein the controller is configured to control the second tray assembly so that the second tray assembly moves in a reverse direction after moving to an ice separation position in a forward direction so as to take out the ice in the ice making cell when the ice is completely made in the ice making cell; wherein the controller is configured to control the second tray assembly so that the supply of the water starts after the second tray assembly moves to a water supply position in the reverse direction when the ice is completely separated; wherein the additional heater is turned on in at least a partial section in which the cooler is configured to supply the cold air so that bubbles dissolved in the water inside the ice making cell move toward the water in a liquid state in an ice generating portion to be capable of generating transparent ice; wherein, when the ice making process is completed, a degree of attachment between the ice of the ice making cell and the first tray assembly is greater than a degree of attachment between the ice of the ice making cell and the second tray assembly, and wherein the controller is configured to control the heater to be turned on before the second tray assembly moves to the ice separation position in the forward direction so that ice is easily separated from the first tray assembly. a storage chamber configured to store food; a cooler configured to supply cold air into the storage chamber; a first temperature sensor configured to sense a temperature within the storage chamber; a first tray assembly configured to define one portion of an ice making cell that is a space in which water is phase-changed into ice by the cold air, a second tray assembly configured to define the other portion of the ice making cell, the second tray assembly being connected to a driver to contact the first tray assembly in an ice making process and to be spaced apart from at least a portion of the first tray assembly in an ice separation process; a water supply part configured to supply the water into the ice making cell; a second temperature sensor configured to sense a temperature of the water or the ice within the ice making cell; a heater disposed adjacent to the first tray assembly; an additional heater disposed adjacent to the second tray assembly; and a controller configured to control the cooler, the second tray assembly, the heater and the driver; wherein the controller is configured to control the cooler so that the cold air is supplied to the ice making cell after the second tray assembly moves to an ice making position when the water is completely supplied to the ice making cell; wherein the controller is configured to control the second tray assembly so that the second tray assembly moves in a reverse direction after moving to an ice separation position in a forward direction so as to take out the ice in the ice making cell when the ice is completely made in the ice making cell; wherein the controller is configured to control the second tray assembly so that the supply of the water starts after the second tray assembly moves to a water supply position in the reverse direction when the ice is completely separated; wherein the additional heater is turned on in at least a partial section in which the cooler is configured to supply the cold air so that bubbles dissolved in the water inside the ice making cell move toward the water in a liquid state in an ice generating portion to be capable of generating transparent ice; wherein, when the ice making process is completed, a degree of attachment between the ice of the ice making cell and the first tray assembly is greater than a degree of attachment between the ice of the ice making cell and the second tray assembly, and wherein the controller is configured to control the heater to be turned on before the second tray assembly moves to the ice separation position in the forward direction so that ice is easily separated from the first tray assembly.