Quick answer: The blue sheet mask featured in this guide is Pyderin’s SOS Hyal Soothing Mask. Pyderin is a Korean professional skincare brand associated with clinics and pharmacies. This guide explains the product’s ingredient label, distinguishes cosmetic claims from evidence, and outlines shopping options.
- The blue sheet mask Hailey Bieber wore in her Seoul selfie is Pyderin's SOS Hyal Soothing Mask, made by Korean company B&K (비앤케이).
- Pyderin is a professional PDRN skincare brand sold through dermatology clinics and pharmacies, not mainstream beauty chains like Olive Young.
- It's a hydrating, soothing mask, built on hyaluronic acid, PDRN, panthenol and azulene. Expect moisture and calm skin, not a facelift.
- It's hard to find right now. Pyderin told us it was grateful for the free global exposure, but had almost no stock left to sell.
- We met Pyderin three days before the photo went up. Here's the behind-the-scenes story, plus what's actually inside the mask and where to buy it.
"Some K-beauty stories begin in a lab. This one began with a selfie"
In late October 2026, Justin Bieber came back to Seoul for the first time in 13 years to open a pop-up store for his brand SKYLRK in Seongsu, Seoul. Hailey Bieber, his wife, came with him and the couple left their mark all over the city: restaurants, cafés, a vintage Piaget watch from a Seoul boutique, an early birthday cake, banana milk, and the city's buzziest chapssaltteok (sweet rice cakes).
And then there was one photo. Hailey, relaxed, with a sheet mask on her face. Not a white one. A bright blue one.
The same questions kept coming. What mask is that? Which brand? Where can I buy it? Beauty influencers went looking for it and started posting what they found. Suddenly a sheet mask was the story of the trip.
The answer was a brand most people outside Korea had never heard of: Pyderin.
What Is Pyderin?
Pyderin (피데린) is a professional PDRN skincare brand from Korea, made by B&K (비앤케이). It was built for hospitals, dermatology clinics and pharmacies, with two separate product lines:
- Clinic-exclusive line: toner, ampoule, cream, cleanser, mask and a hair solution, designed to calm and support skin right after in-clinic procedures.
- Pharmacy-exclusive "Booster" series: easier daily products for consumers, split into three lines: Rejuvuster (anti-aging), Clearvuster (pores) and Hydrovuster (hydration and soothing).
Its whole identity is PDRN, the "salmon DNA" ingredient Korean dermatology made famous. Pyderin says its raw material is 99% pure, extracted from Korean chum salmon, with a molecular size of about 150 base pairs (97 kDa), heavy metals not detected, and a U.S. FDA Drug Master File (DMF) registration for the raw material.
The brand also publishes its certificate of origin, purity test data and process patents, which is unusual in a category where most brands keep the details vague. That's why you won't find Pyderin at Olive Young. It lives in clinics and in pharmacy-style beauty spaces like Optima Wellness Museum, where a pharmacist explains the product before you buy it.
The Mask: Pyderin SOS Hyal Soothing Mask
The blue mask in Hailey's photo is the SOS Hyal Soothing Mask, the final step in Pyderin's pharmacy-exclusive Hydrovuster line for sensitive, irritated and dry skin. The line works as a three-step system:
- SOS Derma Soothing Serum to calm redness
- Rebarrier Soothing Cream to rebuild the moisture barrier
- SOS Hyal Soothing Mask to lock in hydration
The mask's key ingredients are PDRN, 10 layers of hyaluronic acid, PGA (polyglutamic acid) and azulene, a calming blue compound from chamomile. That's likely where the blue comes from. Pyderin's own data reports a +53.8% increase in skin-surface hydration.
In Korea it's sold in boxes of seven masks. Pack sizes vary by listing, so check the box details before you buy.
Behind the Story: We Met Pyderin Three Days Earlier
Here's the part we still find a little surreal.
Three days before Hailey's photo appeared, we met Pyderin team in their office in Gangnam, Seoul. We talked about the brand's plans: how it wants to grow beyond clinics and pharmacies, its expansion into new markets, and its bigger vision of bringing medical-grade PDRN into everyday skincare. It was a thoughtful, ambitious conversation about a brand that was still mostly unknown outside Korea's professional channels.
Three days later, one of the biggest names in beauty did more for that vision than any marketing plan could. And as far as the brand told us, it wasn't a paid placement. Hailey Bieber found Pyderin on her own.
When we followed up, the team was thrilled, and honest. They were deeply grateful that she had used the product and shared it with the world for free. The problem? They didn't have stock ready to sell. The surge in demand arrived before supply could catch up, which is why the mask has been so hard to find.
Why Did Hailey Choose Pyderin?
Was it luck, or was it intentional?
Honestly, we don't know, and we won't pretend to. Seoul is full of sheet masks. Hailey could have picked any of hundreds, from big brands with global campaigns. Instead she shared a professional, pharmacy-channel PDRN mask with almost no international marketing behind it.
Maybe someone in Seoul recommended it. Maybe it was in a gift bag. Maybe she simply liked a soothing mask after a long week of flights, events and parties. Whatever the reason, the result is the same: a small, science-focused Korean brand got a global spotlight it never paid for, and many more people now know its name.
It's also a clue about where K-beauty is heading. Global shoppers are moving past "whatever's trending" toward clinic and pharmacy brands that talk about ingredients, purity and data. Hailey's selfie didn't create that trend. It just put a face on it.
What's Really Inside the Mask (An Honest Look)
A viral moment is exciting, but you deserve the facts before you spend money. Here's what we found when we looked closely at the published formula.
How much PDRN is actually in it?
The mask advertises 1,000 ppm of a "Derbiome® PDRN 10K" ingredient blend. But the full ingredient list specifies Sodium DNA (PDRN) at 10 ppm, which equals 0.001%. Those numbers aren't a contradiction: the 1,000 ppm refers to the whole blend, and PDRN is only one part of it.
"99% purity" describes the PDRN raw material, not the finished mask. It does not mean the mask contains 99% PDRN.
The good news for sensitive skin: no fragrance (parfum) or ethanol appears in the published ingredient list.
What can you realistically expect?
- Hydration and softer skin. This is the most defensible benefit. Clinical studies on other hyaluronic acid and panthenol formulas support moisturizing and barrier benefits, though they don't prove this exact mask's results.
- Temporarily fewer visible dehydration lines. Plumped, hydrated skin looks smoother right after use.
- Calmer-feeling skin. Panthenol and azulene are classic soothing ingredients.
What about niacinamide?
Niacinamide has real evidence for improving pigmentation, texture and fine lines with continued use. One controlled study, for example, tested 5% niacinamide twice daily for 12 weeks. The mask doesn't disclose its niacinamide percentage, so you can't assume the same results from occasional mask use.
What it probably can't do
Claims of deep regeneration, major collagen rebuilding or lasting lifting remain unproven for this exact mask. The PDRN wound-healing research often quoted in marketing used an ointment on skin-graft donor wounds, which is very different from a sheet mask on healthy facial skin. We also didn't find an independently published clinical trial of this specific product.
If you want the deeper science, read our guide The PDRN Lie? Why Salmon DNA Serums Can't Absorb.
Where to Buy the Pyderin SOS Hyal Mask
These are the channels we could verify. Prices and stock change fast, especially right now.
In South Korea
- Pyderin official online store: KRW 35,200 for seven masks, on preorder with dispatch scheduled for 19 November 2026. This is the clearest confirmed way to order.
- Partner pharmacies: the official pharmacy locator lists partner pharmacies nationwide. Call ahead to confirm the blue SOS Hyal mask is in stock.
- Partner clinics: the official clinic locator lists partner clinics, but product selection and stock vary.
Outside Korea
- Malaysia / Singapore: JuzBeauty lists it at RM 115 for seven masks, with shipping across Malaysia and Singapore.
- Japan: a Qoo10 Japan listing shows JPY 6,170 for 32 g × seven masks.
- Hong Kong: Beautitu lists a seven-mask box at HKD 263, marked preorder.
- Taiwan: a Pyderin-named Shopee store has an SOS Hyal mask listing. Check the pack specifications, which differ from the current official description.
- Singapore marketplace: a Pyderin-named Shopee store lists a soothing-care bundle that includes the SOS Hyal mask.
Note: the overseas entries are retailer or marketplace listings. We did not independently confirm every seller's brand authorization, so buy from reputable sellers and check the packaging when it arrives.
Tips Before You Buy
- Be patient with stock. If it's sold out, preorder from the official store rather than paying inflated resale prices.
- Visiting Seoul? Ask at a partner pharmacy or a pharmacy-style beauty store. A pharmacist can also suggest the rest of the Hydrovuster line for your skin.
- Use it for what it's good at: a hydration and soothing boost after travel, sun, flights or a long week, just like Hailey.
- Patch test first if your skin is reactive.
FAQ
What sheet mask did Hailey Bieber use in Seoul?
The blue sheet mask Hailey Bieber shared during her October 2026 trip to Seoul is the Pyderin SOS Hyal Soothing Mask, a PDRN and hyaluronic acid hydrating mask made by Korean company B&K.
What is Pyderin?
Pyderin is a Korean professional PDRN skincare brand sold mainly through dermatology clinics and pharmacies. It has a clinic-exclusive line and a pharmacy-exclusive Booster series, and uses salmon-derived PDRN that the brand says is 99% pure.
Why is the mask blue?
Most likely because of azulene, a soothing blue compound from chamomile that's common in calming skincare.
Was Hailey Bieber paid to promote Pyderin?
According to what the brand told Yogi Korea, it was not a paid placement. Pyderin said it was surprised and grateful when she shared the product.
How much PDRN is in the SOS Hyal mask?
The mask advertises 1,000 ppm of a PDRN ingredient blend, but the full ingredient list specifies Sodium DNA at 10 ppm, or 0.001%. The "99% purity" claim refers to the raw PDRN material, not the finished mask.
What does the Pyderin SOS Hyal mask do?
Its most defensible benefits are hydration, softer skin and temporarily less visible dehydration lines, plus a soothing feel. Claims of deep regeneration or lasting lifting are not proven for this specific mask.
Where can I buy the Pyderin SOS Hyal mask?
In Korea, the official Pyderin online store offers it on preorder (KRW 35,200 for seven masks), and partner pharmacies and clinics may stock it. Abroad, it appears on retailers and marketplaces in Malaysia, Singapore, Japan, Hong Kong and Taiwan.
Can I buy Pyderin at Olive Young?
Pyderin is positioned as a clinic and pharmacy brand, so it's mainly found through partner clinics, pharmacies and pharmacy-style beauty spaces rather than Olive Young.
Related Reading
- The PDRN Lie? Why Salmon DNA Serums Can't Absorb
- Optima Wellness Museum: Where Charlize Theron Shopped
- PDRN Skincare Guide: Salmon DNA, Vegan PDRN & K-Beauty Products
- More K-Beauty Brand Stories from Yogi Korea
Final Word
Most brands spend years and millions trying to get one moment like this. Pyderin got it from a single selfie, three days after telling us where it wanted to go.
Whether Hailey Bieber chose that blue mask by chance or on purpose, the outcome is clear: a quiet, clinic-born Korean brand is now on the world's radar. The real test starts now. Can Pyderin restock fast enough, and will the product live up to the attention? Based on its formula, expect a lovely hydrating, soothing mask, not a miracle. And honestly, that's exactly what most of us want after a long day.
Did you spot the blue mask in Hailey's photo, or have you tried it already? Tell us in the comments. 👇