A method for a first device to perform wireless communication and a device supporting same. The method may include: receiving, from the base station through a second PDCCH, a second DCI including information related to a second SL resource and information related to a second PUCCH resource; transmitting a first physical sidelink shared channel (PSSCH) based on the first SL resource; and transmitting, to the base station through the second PUCCH resource, first hybrid automatic repeat request (HARQ) feedback information related to the first PSSCH and second HARQ feedback information related to the second PSSCH, based on a slot including the first PUCCH resource being same as a slot including the second PUCCH resource, wherein the second DCI is a last DCI among a plurality of DCIs including information related to the slot for PUCCH transmission.