I can’t speak for the URC code, but the Mute-182-power code should work. See below. I can only speak for U.S. models, though. The service code should be the same (Mute-182-Power is apparently Korean for “be quiet and work fast”), but the TV may or may not have Cal modes. Make sure your TV has the latest firmware.
When the TV is off, Press the following sequence: Mute-1-8-2-Power. The TV should turn on in the service mode. There should be a menu called “Expert”, which will have the “N/D Adjust” setting. Set it to “On” and cycle the power on the TV. The TV should have the Cal-Night/Day modes when you turn it back on.
Make adjustments to those modes as you want, then repeat the service process above to switch the setting to “fix”, which will lock those modes.