In 2007, the Korean Society for Medical Ethics Education (KSMEE), with the support of the Korean Academy of Medicine (KAM), developed a clinical ethics core curriculum for medical trainees in Korea. This article provides a summary of the contents of the curriculum developed by the KSMEE. The curriculum consists of six main subjects: doctor-patient relationships, interpersonal relationships with colleagues and paramedical persons, ethics related health policy, withholding and withdrawing of treatment, research ethics, and professionalism. Each main subject has three to four sub-sections. All issues were generated by medical ethics experts by means of group discussions and a survey of medical trainees at various university hospitals in Korea. Each subtitle has four parts including a general overview, learning goals, and two to three relevant clinical cases with key references. This curriculum is primarily for medical trainees, who are not well prepared for the diverse ethical challenges and ethical dilemmas they may face during their daily clinical activities.