The science
The protection architecture in this cream is what sunscreen formulators call a two-phase system, and it is uncommon enough in Korean products to merit explanation. Four of the five filters are oil-soluble: ethylhexyl triazone, whose exceptionally high specific extinction makes it the most efficient UVB absorber available; bis-ethylhexyloxyphenol methoxyphenyl triazine, a photostable broad-spectrum triazine; diethylamino hydroxybenzoyl hexyl benzoate, an inherently photostable long-wave UVA absorber; and polysilicone-15, a silicone-backbone UVB filter that also improves film formation. The fifth, terephthalylidene dicamphor sulfonic acid, is water-soluble and absorbs short and mid UVA from within the aqueous phase. Distributing filters across both phases increases the total filter load the emulsion can carry without becoming heavy and, in published photostability work on European filter combinations, yields systems that retain most of their UVA absorbance after hours of simulated sun exposure, unlike unstabilised avobenzone systems that lose a large share within the first hour. That retained UVA absorbance is what a PA++++ rating measures in the laboratory and what the wearer relies on at four in the afternoon.
The skincare layer has one active with strong evidence and several with none. Niacinamide, in ninth position, has randomised, vehicle-controlled trial support at 2 to 5 percent for reducing hyperpigmentation, strengthening the barrier and moderating UV-induced immunosuppression, all of which are relevant beneath a daily filter film; its placement here is consistent with a working level, though the brand does not disclose one. The Probioderm complex, Lactobacillus ferment with fructooligosaccharides, inulin and fructan, has laboratory data for conditioning and mild anti-inflammatory activity, and no clinical evidence of altering the skin microbiome in a leave-on product. Collagen extract at 102,000 ppb, or 0.01 percent, functions as a humectant at that level and cannot penetrate; the twelve peptides that follow, including acetyl hexapeptide-8, copper tripeptide-1 and palmitoyl pentapeptide-4, each have trial data at concentrations orders of magnitude above what their tail positions imply. Panthenol, beta-glucan, ceramide NP with cholesterol and lecithin, and oat kernel extract form a base with established soothing and barrier-supporting roles, which together with the absence of fragrance and alcohol explains the low irritation reported. None of the five filters is a permitted active under the US sunscreen monograph, which is why the product carries Korean rather than FDA-regulated labelling.