Abstract: A memory system includes: a memory device including a plurality of blocks each block including a plurality of pages, suitable for performing an operation in response to a command and an address; and a controller suitable for determining whether a block in which a read fail has occurred is an open block including an unprogrammed page, performing a restoration operation for the unprogrammed page of the open block based on at least one of operation temperature information and a read count, when it is determined that the block in which the read fail has occurred is the open block, and generating the command for performing a read retry operation.