Hi JaeHyeong,
Greetings from Syncfusion support.
We have checked your query. But unfortunately, the reported issue is not replicated in our end. Here we have attached the ensured sample. Also, we don’t need to add any additional configuration for using the AutoComplete in the various language. If still issue persists, kindly revert with the below details.
1. Code snippet
2. Issue replicating video demonstration
3. If you used the localization in the application, provide the localization information accordingly
4. Syncfusion nuget version
5. If possible, reproduce the reported issue in the attached sample.
Kindly check the above sample and provide the above-mentioned details that will help us to validate the issue further and provide you a better solution from our end.
Regards,
Sevvandhi N