The time difference between China and South Korea is one hour, with South Korea being one hour faster than China.
The time difference between two countries is calculated based on the time zone of the capital city. Beijing, the capital of China, is located in the GMT+8 time zone, while Seoul, the capital of South Korea, is located in the GMT+9 time zone. A time zone that differs by one hour. Therefore, the time difference between China and South Korea is one hour.