The present invention relates to a heat management system having performance improved by reducing a distance between components constituting a refrigerant module and minimizing a pressure loss of a refrigerant, the heat management system including: a first heat exchanger heat-exchanging a heat exchange medium flowing thereinto from a compressor; a first expansion valve expanding the heat exchange medium flowing thereinto from the first heat exchanger and transferring the expanded heat exchange medium to a condenser; a second expansion valve expanding the heat exchange medium flowing thereinto from the condenser; a second heat exchanger heat-exchanging the heat exchange medium flowing thereinto from the second expansion valve with a heat-generating component; an accumulator storing the heat exchange medium flowing thereinto from the second heat exchanger; and an internal heat exchanger heat-exchanging the heat exchange medium discharged from the condenser with a heat exchange medium discharged from an evaporator.