Setting time by network does not change timezone. Showing as “
America/Los_Angeles” is how the time is displayed, and is unrelated to whether the time is set correctly or incorrectly. If you’ve set as “Korea/Seoul”, then when translating for display of time, adjustments would be made.
If you’ve set this up to display as “Korea/Seoul”, then this would be visible from:
To clarify, you can set the time right or wrong regardless of whether you are in “America/Los_Angeles” or “Korea/Seoul”. Network time setup does not care about display, it cares about the UCT time. If it is wrong, can you try to edit “
/etc/timezone”? Just save a copy of what it is now, and experiment with editing directly with an editor.
Also, each individual user may have clocks or other widgets personally set in the GUI during login. These too are unrelated to what the system setting is, as a user can change display to different timezones depending on preferences.