From the article:

South Korea raised its health alert to the highest level on Friday after a mass walkout by trainee doctors this week, while the prime minister said public hospitals would extend working hours to respond to growing strains on the medical system.

Almost two-thirds of the country’s young doctors have walked off the job to protest a government plan to admit more students to medical schools, forcing hospitals to turn away patients and cancel procedures, and raising fears about further disruption to the medical system should the dispute drag on.

…

Emergency departments in South Korea’s biggest hospitals have been squeezed since trainee doctors began leaving the job this week in protest at the government plan.

The doctors taking part in the protest say the real issue is pay and working conditions, not the number of physicians.

I’d like to see a more in-depth article about this, given that other reporting says that it is about increasing the number of medical students.

I’m guessing that part of the issue might be disparities between new doctors and established, older doctors, who are paid much more?