Is Health Care Free in South Korea?

Excuse me, I'm a bit confused about South Korea's healthcare system. I've heard different things about whether health care is free there or not. Could you please clarify? Is healthcare in South Korea truly free for all citizens, or are there certain conditions or qualifications that need to be met? Also, if it's not completely free, what are the main costs involved for the average person? And how does the South Korean government ensure access to quality healthcare for its citizens? Thank you for your time and assistance.