Yaan Clinic Doctors and Medical Team
Yaan Clinic · Gangnam, Seoul
The Yaan Clinic medical team in Gangnam, Seoul, is led by founder and chief doctor Dr. Wontak Choi and includes five directors: a specialist plastic surgeon, a board-certified obesity specialist and three further directors. Every credential below is reproduced as Yaan Clinic publishes it, and the doctors treat patients directly, with no substitute practitioners.
The Yaan Clinic medical team is the group of physicians who consult with and treat patients at Yaan Clinic in Gangnam, Seoul. At Yaan Clinic, the same doctor who plans your treatment performs it: the clinic states it uses dedicated doctors, no substitute practitioners, and carries treatment liability insurance. This page introduces the six current doctors and links to each full profile.
Good to know: Yaan Clinic is an aesthetic clinic. Its doctors are physicians with the titles and memberships listed below; none is presented as a dermatologist. Credentials are copied from Yaan Clinic's own medical staff page without additions.
Who are the doctors at Yaan Clinic?
Yaan Clinic currently lists six doctors: Dr. Wontak Choi (founder and chief doctor), Dr. Yoonsik Sung, Dr. Dajeong Hyeon, Dr. Yookyeong Sim, Dr. Giyong Byeon and Dr. Seonggeun Hwang.
| Doctor | Role at Yaan Clinic | Title or focus as listed |
|---|---|---|
| Dr. Wontak Choi | Founder Chief Doctor | Specialized in Petit, Body contouring |
| Dr. Yoonsik Sung | Specialist Plastic Surgeon | Specialized in Plastic Surgeon |
| Dr. Dajeong Hyeon | Director | Aesthetic-Focused Medical Doctor |
| Dr. Yookyeong Sim | Director | Aesthetic-Focused Medical Doctor; Board-Certified Obesity Specialist |
| Dr. Giyong Byeon | Director | Aesthetic-Focused Medical Doctor |
| Dr. Seonggeun Hwang | Director | Specialized in Petit, Body contouring Surgery |
Dr. Wontak Choi – Founder and Chief Doctor
Dr. Wontak Choi founded Yaan Clinic and is its chief doctor, specialized in petit treatments and body contouring. Dr. Choi holds a Master of Science from Seoul National University College of Medicine and is listed as a Visiting Professor at Hanyang University College of Medicine.
Yaan Clinic also lists Dr. Choi as Key Doctor at Germany MERZ (manufacturer of Xeomin), Academic Director of the Korean LaserSkin & Hair Society, and a training instructor for Daewoong DNC, JW Pharmaceutical and Amorepacific Pharmaceutical fillers. Read Dr. Wontak Choi's full profile.
Dr. Yoonsik Sung – Specialist Plastic Surgeon
Dr. Yoonsik Sung is the Specialist Plastic Surgeon at Yaan Clinic. Dr. Sung previously worked at Chic, JJ and Wonjin plastic surgery clinics and is a member of the Korean Society of Plastic and Reconstructive Surgeons.
Further memberships include the Korean Society of Aesthetic Plastic Surgery and societies for eyelid surgery, craniofacial plastic surgery and rhinoplasty research. Read Dr. Yoonsik Sung's full profile.
Dr. Dajeong Hyeon – Director
Dr. Dajeong Hyeon is a Director of Yaan Clinic and an aesthetic-focused medical doctor who studied at Ewha Womans University College of Pharmacy and Kyungpook National University School of Medicine.
Yaan Clinic lists Dr. Hyeon as "Board Certified Specialist, Asan Medical Center" (the specialty is not named) and as a medical advisor to Fibest, Dongkook Pharmaceutical (Bellast) and BNS MED. Read Dr. Dajeong Hyeon's full profile.
Dr. Yookyeong Sim – Director
Dr. Yookyeong Sim is a Director of Yaan Clinic and a Board-Certified Obesity Specialist of the Korean Society for the Study of Obesity. Dr. Sim is a graduate of Princeton University and a former Clinical Professor at Asan Medical Center.
Dr. Sim was previously a resident and clinical fellow at Seoul National University Hospital and a director at L'Medique. Read Dr. Yookyeong Sim's full profile.
Dr. Giyong Byeon – Director
Dr. Giyong Byeon is a Director of Yaan Clinic and an aesthetic-focused medical doctor, formerly director of The Dream Clinic and Rebirth Clinic.
Dr. Byeon is a member of laser, aesthetic and obesity medical societies and a medical advisor to Fibest, Dongkook Pharmaceutical (Bellast) and BNS MED. Read Dr. Giyong Byeon's full profile.
Dr. Seonggeun Hwang – Director
Dr. Seonggeun Hwang is a Director of Yaan Clinic, specialized in petit and body contouring surgery, and the former Chief Director of Channel Plus Clinic.
Dr. Hwang is a regular member of societies for aesthetic and laser medicine, aesthetic surgery, aesthetic plastic surgery, anti-aging medicine and nasal research. Read Dr. Seonggeun Hwang's full profile.
How is my doctor chosen?
Your doctor is arranged by Yaan Clinic based on the treatment you need and availability. You can ask for a specific doctor, or for a male or female doctor, when you book.
Several Yaan treatment pages, including Ultherapy, TuneFace and miraDry, state that male and female doctors are available and that directors perform treatments directly. Treatments themselves are described in the aesthetic treatment hub, the botox guide and the skin tightening guide.
What does the team hold collectively?
Beyond individual credentials, Yaan Clinic as a whole states several manufacturer statuses, such as Restylane and Radiesse key doctors and an official Artecoll clinic, and a 2018–2024 record of conference lectures and live demonstrations in Korea and abroad.
Learn more on About Yaan Clinic and Genuine Products & Safety.
For international patients: You can request a consultation by WhatsApp or the international line on +82 10 5308 0499, or by email at yaan09@naver.com. Interpreters in English and Chinese are available. See how to book an appointment at Yaan Clinic.
Frequently asked questions
Are the doctors at Yaan Clinic dermatologists?
No. Yaan Clinic does not present any of its doctors as a dermatologist. The team includes a specialist plastic surgeon, a board-certified obesity specialist and aesthetic-focused physicians, with credentials listed exactly as Yaan Clinic publishes them.
Can I choose my doctor at Yaan Clinic?
You can request a specific doctor, or a male or female doctor, when you book. Yaan Clinic will confirm availability for your treatment and dates. Contact the international line or WhatsApp on +82 10 5308 0499.
Will the doctor I consult with perform my treatment?
Yaan Clinic states that it uses dedicated doctors with no substitute practitioners, and several treatment pages note that directors perform treatments directly. Confirm the arrangement for your specific treatment at consultation.
Do Yaan Clinic doctors speak English?
Yaan Clinic provides dedicated interpreters in English and Chinese, with multilingual coordinators supporting you from consultation to recovery, so you can discuss your treatment clearly with your doctor.
Related pages
Book a consultation at Yaan Clinic
WhatsApp / international line: +82 10 5308 0499 · KakaoTalk · Email: yaan09@naver.com
English & Chinese interpreters · Same prices as local patients · How to book
About this information: Prepared from Yaan Clinic's published treatment information. Treatments at Yaan Clinic are performed by licensed physicians — meet our doctors. Last updated: October 2026. This page is general information, not a substitute for an in-person medical consultation; suitability, dosage and results are confirmed by your doctor.
