The short version

How ONDA works — Coolwaves, a patented technology using 2.45GHz microwaves. The manufacturer describes it as disrupting the membranes of subcutaneous fat cells while also stimulating collagen production.
Price is set by dose, areas, device generation, anaesthesia and whether aftercare is included; different conditions are not comparable
Article 56 of Korea’s Medical Service Act prohibits advertising that guarantees an outcome
In Cheongdam, Gangnam, judge access by the nearest station and the walk rather than by the district name
Confirm English support as two questions: on site or booked, and reachable after you fly home

What ONDA is

Coolwaves, a patented technology using 2.45GHz microwaves. The manufacturer describes it as disrupting the membranes of subcutaneous fat cells while also stimulating collagen production. Two handpieces at different depths. The deeper one is used for localised fat on the abdomen, flanks, knees, buttocks and underarms; the shallower one for cellulite, skin firmness and the submental area.

The first question for ONDA: which handpiece

There are two handpieces at different depths and they target different things — the deeper one localised fat, the shallower one cellulite and skin firmness. "Which handpiece for my area, and why?" is the question that separates clinics fastest. A clinic that cannot make that distinction is pricing by area rather than planning by finding.

Six questions for a ONDA clinic in Cheongdam, Gangnam

All six can be asked before you travel, by email or message. How specific the answers are is itself the information — a good answer contains numbers and proper nouns, a vague one is made of adjectives.

Ask	Why it matters	What a good answer looks like
The exact model and generation	The same procedure name covers different machines	Names the model and the year it was installed
Who performs the treatment	Judgement about depth and amount drives the result	"The doctor throughout" or "a nurse for part of it" — either, stated clearly
Which handpiece for which area	The deeper and shallower handpieces target different things	Names the handpiece per area, with a reason
How the session count is arrived at	One session is not automatically the plan	Justified by area and goal, not by package
What the quoted price includes	Anaesthesia and aftercare billed separately change the real total	Separates what is included from what is extra
Who to contact after you fly home	Nine thousand kilometres away, this is the difference between aftercare and none	A named channel, a stated response time, and a follow-up plan

English-speaking is not the same as English-supported

"We speak English" and "your consultation happens in English" are different claims, and the second one is decided by whether the English-speaking staff member is on site or booked for the day.

Looking for a clinic in Cheongdam, Gangnam

Cheongdam sits in Seoul’s Gangnam district, with clinics clustered between Cheongdam station on Line 7 and Apgujeong Rodeo on the Bundang line. How far the walk from the station is, and whether there is parking, affects planning more than the district name does — so judge the location by the exit number and the walk rather than by "Cheongdam".

Questions people ask

How does ONDA actually work?

Coolwaves, a patented technology using 2.45GHz microwaves. The manufacturer describes it as disrupting the membranes of subcutaneous fat cells while also stimulating collagen production.

Is this a weight-loss treatment?

No, and a clinic describing it that way is worth a second look. The manufacturer lists localised fat, cellulite and skin laxity — localised is the operative word. It addresses a specific area, not overall body weight, and the two are not interchangeable.

Can it be done on the same day as a lifting treatment?

That is a clinical judgement rather than a rule, and it is worth asking specifically because the two act on different layers — this device on the fat layer, ultrasound and radiofrequency lifting on the skin and support structures. A clinic that can explain how it sequences them is answering a different question from one that simply offers both.

Can I ask whether the doctor performs the treatment personally?

Yes. For ONDA the judgement that matters most is the number of areas, and which handpiece is used on each, and asking who makes it is the same question as asking who performs the treatment. Either answer is fine; a clinic that answers clearly is the prepared one.

How much should online reviews weigh when choosing for ONDA?

Less than the answers to the six questions above, and for a specific reason: Article 56 of Korea’s Medical Service Act restricts advertising that guarantees outcomes or is liable to mislead, so the reviews most visible to you are the least regulated part of what you are reading. A specific answer about the number of areas, and which handpiece is used on each is checkable in a way that a rating is not.

What if I am told a package is the only option?

Ask what a single session costs and what it is expected to achieve given the number of areas, and which handpiece is used on each. If that question has no answer, the package is the product rather than the treatment.

What if the consultation and the treatment are on the same day?

That is normal for a short trip and is not a problem in itself. What is worth protecting is the gap between being told the number of areas, and which handpiece is used on each and agreeing to it — even an hour is enough to read the plan again. A plan that only holds if you decide immediately is telling you something.

What this page is based on

DEKA — ONDA Coolwaves product page — https://dekalaser.com/products/onda/ (checked 2026-09-05)
Medical Service Act of Korea, Article 56 (Prohibition of Medical Advertising) — https://www.law.go.kr/법령/의료법/제56조 (checked 2026-09-05)