Try to open the KOR iso in wiiscrubber using the Korean common key. Right click on the game partition and save unencrypted. Then close wiicrubber and open the iso again with wiicrubber using the normal common key. Right click on the game partition (displayed as bad) and load the unencryped partition you saved. Delete the update and/or installer partion. Then load into wbfs manager.
Extract these to separate folders