- Seoul National University Hospital Intern
- Seoul National University Hospital Resident
- Jeon Kang, Assistant Professor, Gyeongsang National University Hospital
- Assistant Professor, Soonchunhyang Hospital
- Assistant Professor, Associate Professor, Soonchunhyang Bucheon Hospital
- Department of Radiation Oncology, Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
