Refrigerator and ice maker

A refrigerator, comprising:

• a cabinet configured to provide a storage compartment;
• a door configured to open and close the storage compartment;
• and
• an ice maker disposed in the storage compartment or at the door to provide ice, wherein the ice maker comprises:
• a first tray configured to define a first portion of an ice-making cell;
• a first tray case configured to support the first tray;
• a second tray configured to define a second portion of the ice-making cell, and to move with respect to the first tray;
• and
• a second tray case configured to support the second tray, wherein, after supply of water to the ice-making cell while the second tray is at a water supply position, the second tray is to move in a first direction to an ice-making position, after generation of the ice while the second tray is at the ice-making position, the second tray is to move in a second direction so as to draw the ice out of the ice-making cell, and then the second tray is to move in the first direction to the water supply position, wherein at the water supply position, the second tray is spaced from a portion of the first tray, and the first tray case includes a water overflow prevention wall configured to surround part of the first tray by being spaced apart from the first tray when the second tray is disposed at the water supply position, and wherein based on the second tray disposed at the water supply position, a portion of the second tray is disposed between the water overflow prevention wall and the first tray.