The sentiment analysis v3 feature of Cognitive Services Text Analytics now supports Korean in addition to English, Japanese, Simplified and Traditional Chinese, Spanish, Italian, French, Portuguese, German, and Dutch.
Sentiment analysis v3 is available in the following regions—Australia East, Central Canada, Central US, East Asia, East US, East US 2, North Europe, Southeast Asia, South Central US, UK South, West Europe, and West US 2.
For more information on the API and the request and response payloads, see the API documentation.