TMTPOST -- OpenAI announced plans on Monday to open its first office in Seoul and has formally established a local entity in South Korea, reflecting surging demand for its ChatGPT service in the country. South Korea now ranks as the second-largest market globally for paid ChatGPT subscriptions, trailing only the United States, according to the company. OpenAI has begun hiring to support local operations and partnerships, with more details on its expansion strategy in South Korea expected in the coming months.