A cooling system and a refrigerator including a cooling system are provided. The cooling system may include a linear compressor (100) including a reciprocating piston and a cylinder (120) that accommodates the piston and having an outer circumferential surface, into which a refrigerant may be introduced, a refrigerant filter device provided in the linear compressor to filter the refrigerant introduced into one or more gas inflow of the cylinder, a condenser (20) that condenses the refrigerant compressed in the linear compressor, and a dryer (200) that removes foreign substances or oil from the refrigerant condensed in the condenser. The dryer may include a dryer body (210) including a refrigerant inflow (211), through which the refrigerant condensed in the condenser may be introduced, and a refrigerant discharge (215), through which the refrigerant may be discharged, and an adsorption filter (430) accommodated in the dryer body to filter the oil in the refrigerant introduced through the refrigerant inflow.