The device CY8C4248LQI-BL483, as such has emissions (LO Leakage) that could exceed the Korean limit of -54 dBm. But this can be reduced using a low pass matching network in the front end.
The following modules have the same radio as CY8C4248LQI-BL483 and have been certified for Korea.
All these modules have implemented a low pass filter based matching network to filter out the LO leakage for receiver. The datasheet of these modules should have the schematics used in them.