
Mixsoon
A multi-tasking serum combining centella asiatica extract, bifida ferment, and hyaluronic acid to soothe, strengthen skin barrier, and provide deep hydration. Suitable for sensitive and irritated skin seeking calming and moisturizing benefits.
soothing, healing, anti-inflammatory
Small molecule humectant that penetrates skin deeply
Editorial baseline from K-beauty clinical research and community consensus. Real subscriber reports layer on as the community grows.

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The key active ingredients in Master Serum by Mixsoon include Centella Asiatica Extract (soothing, healing, anti-inflammatory), Bifida Ferment Extract (Probiotic extract that strengthens skin barrier), Hydrolyzed Hyaluronic Acid (Small molecule humectant that penetrates skin deeply). Drawing on K-beauty research and community consensus, key ingredients show 85% effectiveness for redness in sensitive skin types. Seoul Sister tracks ingredient effectiveness across 5,900+ K-beauty products to provide data-backed recommendations.
Master Serum is a Korean serum by Mixsoon. Sensitive skin compatibility depends on individual triggers and allergies. Seoul Sister's AI advisor Yuri analyzes all 5 ingredients against your specific skin type, concerns, and known allergens to provide a personalized compatibility score. Common irritant ingredients like fragrance, alcohol denat, and essential oils are flagged automatically.
For oily skin, the key factors in evaluating Master Serum are comedogenic ingredient ratings, oil content, and finish type. This serum contains 3 active ingredients. Seoul Sister's database cross-references each ingredient's comedogenic rating (0-5 scale) against your skin type to identify potential pore-clogging risks. Subscribe for a personalized oily skin compatibility analysis.
Master Serum by Mixsoon is sold through authorized retailers and the brand itself. Buy from an authorized retailer or the brand's own site rather than an open marketplace. Olive Young Global ships to most countries but no longer ships to the US. Seoul Sister tracks counterfeit indicators to help you buy genuine Korean skincare. We are an advice platform and never sell products ourselves.
That $11 Korean cleanser outperforming your $38 one is not hiding anything. The low price comes from how the Korean beauty industry is built, not from what is in the bottle. With one geographic catch.
Sulwhasoo First Care Serum is a $90+ luxury product, which makes it one of the most counterfeited items in K-beauty. Here are five verifiable checks (from packaging weight to barcode origin) to confirm your bottle is real before it touches your face.