Two Frequencies Are Not a Facelift
Xerf is a Korean radiofrequency device that adds 2 MHz to the usual 6.78 MHz. What the second frequency changes, what the small studies show, and how a Seoul shot quote is built.


Skin
Same Heat. Different Depth.
A Seoul Ultherapy or Thermage quote is a shot count, not a lifted jaw. How HIFU and RF differ, what Korea approved them as, and how the cost is built.
The number on the tile is a count. It is not a lift.
A Gangnam desk replies on Kakao in four minutes. "Ultherapy 300 shots." "Thermage 600 shots." "Shurink, full face." The words look like the same product in three sizes. They are not. One counts rows of ultrasound points. One counts pulses of radiofrequency from a single-use tip. One may not tell you what it counts at all. Visitors compare the shot numbers across devices, pick the bigger one, and fly home with a treatment they could not describe.
If you remember one test, remember this. Ask what is being counted, at what depth, on which part of your face. A shot count without a device name, a tip or cartridge, and an area is not a quote. It is a number.
The energy. Ultherapy and Shurink are high-intensity focused ultrasound. A transducer pushes ultrasound to a chosen depth and makes tiny points of heat, called thermal coagulation points, below the surface. The Ulthera System adds live ultrasound imaging, so the operator can see the layers and the bone before firing.1 Shurink is a Korean HIFU line from Classys that works with cartridges, and its Korean approvals have been granted cartridge by cartridge, such as a 2 mm cartridge for wrinkles around the eyes, mouth and neck.3
Thermage and Oligio are monopolar radiofrequency. A tip on the skin passes a 6.78 MHz current into the tissue while the surface is cooled, so heat builds in a broad layer rather than in points.4, 8 Thermage FLX comes from the US company Solta. Oligio comes from the Korean company Wontech.
| Ultherapy | Shurink | Thermage FLX | Oligio | |
|---|---|---|---|---|
| Energy | Microfocused ultrasound with imaging1, 2 | High-intensity focused ultrasound3 | Monopolar RF, 6.78 MHz, surface cooling4 | Monopolar RF, 6.78 MHz, surface cooling8 |
| How heat lands | Points at set depths | Points at set depths, by cartridge | Broad layer under a single-use tip6 | Broad layer under a disposable tip8 |
| Korea (MFDS) | Approved since 2009; Ultherapy Prime approved 20252 | Approved; Shurink Universe 2 mm cartridge added eye, mouth and neck wrinkles in late 20243 | Import approval August 20185 | Approved June 20207 |
| US FDA record | Cleared to lift the brow and lax tissue under the chin and on the neck, and for décolleté lines1 | No 510(k) found under the Shurink name (searched October 2026) | Cleared for non-invasive treatment of wrinkles, including around the eyes4 | Cleared for electrocoagulation and hemostasis of soft tissue, not a wrinkle claim8 |
Korean approvals as reported in Korean press citing the Ministry of Food and Drug Safety (MFDS); US wording from the FDA 510(k) database, accessed 7 October 2026. Approval describes a device and its intended use, not a result for you. Not a product recommendation.
Approval is about the machine, not about your jaw. And one brand can mean different generations of machine in different rooms, so ask which model is on the cart.

Less than the menus suggest. In a split-face trial, 20 adults with mild to moderate laxity had focused ultrasound on one side of the face and monopolar radiofrequency on the other in the same visit. Both sides improved by day 30 and stayed improved at six months. The difference between the sides was not statistically significant, and neither was the difference in satisfaction or side effects.9 It was a small study. It is still the clearest head-to-head there is.
The wider evidence says modest. A 2020 meta-analysis of 17 HIFU studies with 477 participants found a moderate improvement on average, scored at about 2.7 out of 5, and noted that most studies did not follow people for long.10 Systematic reviews of radiofrequency find measurable improvement in laxity with mostly minor, short-lived complications, and higher satisfaction in people who wanted a modest change.11, 12
So the honest sorting question is not ultrasound or radio waves. It is how much loose skin you have. Early slide along the jaw, a softening brow, a neck that is starting, not finished: that is the face these devices are studied on. A heavy jowl or a neck band you can pinch and fold is a surgical conversation, and our guide to SMAS and deep plane facelifts explains what surgery moves that heat cannot. Threads are a third tool that pulls tissue on a suture instead of heating it, covered in our thread lift guide.
A Seoul lifting quote counts device shots, lines or pulses per area. Numbing and a visitor consult fee are extra. As of October 2026, the VAT refund for foreign visitors' cosmetic procedures has ended; it covered treatment received by 31 December 2025.14, 15 By law, clinics post non-covered fees, online too if they have a site, and charge no more.17, 18
Bills pending in the National Assembly would restore the refund, but none had passed when we checked on 21 October 2026.19 We have not found a dated, non-clinic source for Seoul device prices, so this guide prints no won or dollar range. What we can show is how the quote is built, because two tiles with the same brand can be two different treatments.
| Line on the quote | What to ask |
|---|---|
| Device and model | Ultherapy or Ultherapy Prime, Thermage FLX, which Shurink or Oligio model. The name on the machine, not the menu. |
| What is counted | Ultrasound is counted in shots or lines from a transducer or cartridge. Radiofrequency is counted in pulses from a tip sized for a number of shots. |
| Tip or cartridge | Thermage tips are single-use, one patient, one session; a full face commonly uses a 600-shot, 4 cm² tip, per the importer.6 Ask to see it opened. |
| Depth | For ultrasound, which depths and how many lines at each. |
| Area | Full face, lower face, eyes, neck. "Full face" without a map is not an area. |
| Extras | Numbing, consult fee for a visitor, imaging, and any review visit. |
| VAT | Whether the won figure includes it. |
The tip line is not pedantry. Korean press has reported warnings about refilled or unofficially imported Thermage tips, a legal problem in Korea and a safety unknown for you.6
VAT is the quiet line. Many menus still list VAT separately. Ask before you compare.
Dermatology accounted for 62.9 percent of the 2.01 million foreign patients Korea counted in 2025, according to the Ministry of Health and Welfare.16 Our Korea medical tourism statistics page has the breakdown. Volume is why the menus are long. It is not a reason to book the longest one.
Focused ultrasound is often uncomfortable. The HIFU meta-analysis put average pain at moderate.10 Radiofrequency feels like hot pulses under a cold tip. Ask what numbing is offered and how long it sits.
Redness and swelling are the usual aftermath. A 2025 systematic review of microfocused ultrasound with imaging found transient swelling, redness and pain most often in published studies.13 The same review searched the US FDA's adverse-event reports and found fat loss, nerve problems such as numbness, and scarring among the reports filed, plus one report of a later facelift being affected. Those reports are unverified and cannot give a rate, and the authors say the published evidence on later facelifts is thin.13 If your face is already thin, ask about fat loss before anyone mentions shot counts. For radiofrequency, a systematic review found most complications minor and short-lived, with major complications more common with monopolar than bipolar devices.11
The change is slow. In the split-face trial, the improvement became significant at day 30 and held through day 180.9 The mirror in your hotel on day two is not the result. If you have photos or a flight within 48 hours, ask the clinic what swelling to expect.
Send this before you pay a deposit:
A clinic that answers with a model, a count, a depth and an area is selling a treatment. A clinic that answers "our signature lifting" is selling a word.
Yes. Korean press reports that Ultherapy has been approved as a medical device in Korea since 2009, and that the newer Ultherapy Prime platform was approved by the MFDS in 2025.2 Approval covers the device and its intended use, not a result for any one face.
Generation, not energy. Ultherapy Prime is the newer Ulthera platform that Merz launched in Korea in 2025 after MFDS approval, and it is still microfocused ultrasound with imaging.2 A tile that only says "Ultherapy" could mean either machine, so ask which model is on the cart before you compare two quotes.
Ultherapy uses focused ultrasound to make small heat points at set depths, with live imaging. Thermage uses monopolar radiofrequency to heat a broader layer of skin under a cooled tip.1, 4 In a small split-face trial, both improved mild to moderate laxity and the sides did not differ significantly at six months.9
Neither is better for everyone. The evidence does not show a clear winner for mild to moderate laxity.9 Ask the clinic why it suggests one device for your face and areas.
Shurink is a high-intensity focused ultrasound (HIFU) device line made in Korea by Classys. It is approved by the MFDS, and the Shurink Universe model's 2 mm cartridge received added approved uses for wrinkles around the eyes, mouth and neck in late 2024.3 We found no US FDA 510(k) record under the Shurink name.
Those areas are on its US label. The Ulthera System is FDA-cleared to lift lax tissue under the chin and on the neck, and in late 2024 Korea added neck wrinkles to the approved uses of a Shurink cartridge.1, 3 A neck band you can pinch and fold is still a surgical question, and the neck can be its own line on the quote, so ask whether it is counted.
An Ultherapy quote in Korea is built from the device model, the shots or lines, the depths and the areas. Ask for each in writing, plus numbing and VAT. This guide prints no price range, because we have not found a dated, non-clinic source for Seoul device prices.
It depends on the machine. On focused ultrasound, a shot or line is usually one pass that leaves a row of heat points at one depth. On Thermage, a tip is sized for a number of pulses, commonly 600 for a full face per the importer.6 The same number on two devices is not the same treatment.
In the split-face trial, results were measured after a single treatment.9 Repeat timing varies by device and by person, so ask the clinician what they would plan and why.
Gradually. In the split-face trial, improvement became significant at day 30 and held through day 180.9 Results vary with age, skin quality and how much laxity you started with.
Often, yes. A meta-analysis of HIFU studies rated average pain as moderate.10 Ask what numbing the clinic uses and how long it sits before treatment starts.
Usually little. Redness, swelling and tenderness are the most common effects in published studies and are usually short-lived.13 If you have a flight or photos within 48 hours, ask the clinic what to expect on day one and day two.
It has been reported. A 2025 review found fat loss among adverse events filed in the US FDA's database for microfocused ultrasound, alongside nerve symptoms and scarring.13 Those reports cannot give a rate. If your face is thin, ask how depth and areas are planned.
The evidence is thin: a 2025 systematic review found no published evidence of harm to later facelifts and one unverified report in the FDA database.13 If surgery is likely later, tell both the device clinic and the surgeon.
Not necessarily. A low tile can be a different device, fewer lines, a smaller area, or a refilled tip.6 Compare the model, the count, the depth and the area before you call it a deal.
Anyone with heavy loose skin hoping for a surgical result, anyone pregnant, and anyone with an active skin infection where the device goes. People with implanted electronic devices or metal implants in the area should ask before radiofrequency. Anyone on blood thinners or with a nerve condition in the face needs a doctor's plan first.
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This article is for general education and is not medical advice, a diagnosis, or a promise of outcome. It prints no prices; ask the clinic for an itemized quote. Devices and brands are named to explain how they work and how Korea and the US regulate them, not to recommend a device or clinic. If you are pregnant, take blood thinners, have a pacemaker or other implanted device, metal implants in the face, or a nerve condition, speak to a qualified clinician before any energy-based treatment.

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