Former Lecturer, Department of Dermatology, Yonsei University College of Medicine Former Professor, Department of Dermatology, Yonsei University College of Medicine Former Adjunct Professor, Department of Dermatology, Yonsei University College of Medicine Former Assistant Professor, Department of Dermatology, Yonsei University College of Medicine Former Director, Jeju Welfare Dermatology Former Director, Kanghan Dermatology Clinic