I confirmed it *2100 on Dec. 16. //639kHz, The ID is before the time pips, ID as "KBS Je sam Radio, Sarang-ui Sori Bansong, HLKC"
It is the first time that Radio 3 is relayed on SW. The schedule of Radio3 at *2100-1800* . KBS Global Korean Network HLCA carry on 6015kHz to +0400-0858* on Dec. 16. It seems to be test broadcast.
(Sei-ichi Hasegawa via DX Listening Digest)