The official Korean MSIP rule #2016-100 about WLAN 5GHz frequency band has been released. This rule has been effective since September 30, 2016.

below new Korea 5GHz band has been applied:

Band 1 :  5150 MHz ~ 5250 MHz

Band 2 :  5250 MHz ~ 5350 MHz

Band 3 :  5470 MHz ~ 5725 MHz

Band 4 :  5725 MHz ~ 5850 MHz

Therefore, above bands are allowed since September 30, 2016.