A memory system is provided to include a first storage device including a first memory device and a first memory controller configured to receive, from a host external to the first storage device, a request including a logical address corresponding to the request; and a second storage device including a second memory device and a second memory controller coupled to receive a request from the first storage device and to control the second memory device, wherein the first memory controller is configured to select a target address among candidate addresses and map the logical address received from the host to the target address, and wherein the candidate addresses include first physical addresses corresponding to the first memory blocks and virtual addresses corresponding to the second memory blocks included in the second memory device.