The present invention relates to a method for receiving a signal in a wireless communication system supporting narrowband Internet of things (NB-IoT) operated in time division duplex (TDD) and a device therefor, the method comprising the steps of: configuring a search space for a physical downlink control channel; and monitoring the physical downlink control channel on the basis of the configured search space, wherein the search space is configured by a TDD special subframe from which aggregation level 1 has been excluded, and the TDD special subframe indicates a subframe including a downlink period, a guard period, and an uplink period.