Is the rest of the audit trail in English as expected?
It sounds like at runtime the localised value is still being applied. I would:
- Check the localized field value has not been overwritten into an application ruleset
- Check the localization ruleset has not been included as an application ruleset or a production ruleset
- Check there is a field value for the English equivalent, as well as the Korean
- Confirm it's definitely Pega localization and not web browser localization
As a solution, have you tried to create a localized English version of this field value? Also, try clearing the browser cache (or other) - as I previously had issues with German words being displayed after installing a Dutch language pack, but the issue was not persistent.