Dear student,
Applying for a Masters in South Korea
Postgraduate courses at South Korean universities may commence in either of the spring and autumn semesters that make up the South Korean academic year.

For entry onto a course commencing in March, you will need to apply between September and November; for entry onto a course commencing in September the application period runs from May to June.

You can usually apply directly to your chosen university, but the Korean government also offers an online service for overseas students who register at its website.
Allthebest.
Thankyou.