Abstract: An embodiment relates to an operation method of a transmission (TX) UE related to sidelink DRX in a wireless communication system, the method comprising the steps in which: the TX UE establishes a PCS connection with a reception (RX) UE; the TX UE receives a physical downlink control channel (PDCCH) including resource allocation information from a base station; and the TX UE transmits a sidelink signal through a resource based on the resource allocation information to the RX UE, wherein the TX UE performs initial transmission by using a resource related to retransmission on the basis that a resource related to the initial transmission does not overlap with an active time of the RX UE.