Memory system and operating method thereof

A memory system comprising:

• a memory device including a plurality of memory blocks each memory block including a plurality of pages, each page including a plurality of memory cells which are coupled to a word line for storing data;
• and
• a controller including a memory, the controller being suitable for receiving a write command and a read command from a host, storing write data corresponding to the write command in the memory, transmitting and storing the write data stored in the memory to and in at least one first memory device buffer operatively coupled to a first memory block in a page of which the write data are to be stored, reading read data corresponding to the read command from a page of a second memory block, storing the read data in at least one second memory device buffer operatively coupled to the second memory block, and storing the read data stored in the second memory device buffer, in the memory.