A method for operating a first device in a wireless communication system is proposed. The method may comprise: a step of receiving information related to a sync resource from a base station; a step of receiving, from a second device, a first sidelink synchronization signal block (S-SSB) through a first resource; a step in which the first S-SSB comprises at least one symbol related to a sidelink primary synchronization signal (S-PSS), at least one symbol related to a sidelink secondary synchronization signal (S-SSS), and at least one symbol related to a physical sidelink broadcast channel (PSBCH); and a step of obtaining slot information related to the first S-SSB.