Organized by the Korean Medical Association (KMA), the rally was held amid the ongoing protest by trainee doctors at university hospitals, further disrupting medical care for patients.
At the rally, the KMA threatened an indefinite strike next week, if the government fails to address the current healthcare crisis with substantial solutions.
KMA chairman Lim Hyun-taek urged the government to reconsider its plans and withdraw any penalties and punitive actions imposed on striking doctors.
Doctors at the rally expressed concerns through placards, arguing that simply increasing admissions without proper preparations would "lower the quality of medical education." They also criticized the plans, claiming that they would cripple essential medical services.