The 10-Step Method, Explained

An oil-based cleanser — balm, cleansing oil, or micellar oil — dissolves lipid-soluble impurities: SPF filters, sebum, silicones, and long-wear makeup. The chemistry is simple: like dissolves like. Mineral and plant oils bind to the oils on your skin and lift them away without disrupting the acid mantle. Massage for a full 60 seconds before adding water to emulsify. This step is PM-only; in the morning, your skin has not been exposed to SPF or pollution, so a water-based cleanse alone is sufficient.

Look for: Rice bran oil, jojoba oil, mineral oil

A gentle foam, gel, or low-pH cleanser removes water-soluble impurities — sweat, residual oil cleanser, and environmental pollutants. The critical factor is pH: most Western cleansers sit at pH 8–10 (alkaline), which disrupts the skin's acid mantle (pH 4.5–5.5) and triggers barrier dysfunction. Korean cleansers are typically formulated at pH 5–6, preserving the microbiome and preventing the tight, stripped feeling that many people mistake for 'clean'. A 2014 study in the British Journal of Dermatology confirmed that low-pH cleansers significantly reduce skin irritation and TEWL compared to alkaline alternatives.

Look for: Amino acid surfactants, centella asiatica, green tea extract

Chemical exfoliants — AHAs, BHAs, or PHAs — dissolve the bonds between dead skin cells, accelerating cell turnover and improving product absorption. BHA (salicylic acid) is oil-soluble and penetrates pores, making it ideal for oily or acne-prone skin. AHAs (glycolic, lactic, mandelic) work on the surface and are better suited to dry or mature skin. PHAs are the gentlest option and double as humectants. The Korean approach to exfoliation is conservative: less frequently, at lower concentrations, than Western routines. This preserves the barrier while still achieving the cell-turnover benefits.

Look for: Salicylic acid (BHA), lactic acid (AHA), gluconolactone (PHA)

Korean toners are not the astringents of Western skincare. They are lightweight, hydrating preparations that restore the skin's pH after cleansing and prime it for subsequent layers. The most effective Korean toners contain multiple forms of hyaluronic acid, fermented ingredients, and skin-identical lipids. Applied with palms rather than cotton pads, they are pressed gently into the skin to maximise absorption. This is the foundation layer of the hydration stack — everything applied after will penetrate more effectively because of it.

Look for: Hyaluronic acid, beta-glucan, fermented rice water

The essence is the most distinctively Korean step and the one with the strongest clinical backing. Fermented essences — particularly those containing galactomyces ferment filtrate or bifida ferment lysate — have been shown in multiple studies to improve skin texture, radiance, and moisture retention. Fermentation increases the bioavailability of active ingredients by breaking them into smaller molecules that penetrate the skin more effectively. Think of the essence as the delivery mechanism for everything that follows.

Look for: Galactomyces ferment filtrate, bifida ferment lysate, snail secretion filtrate

Serums and ampoules are the most concentrated step in the routine — high percentages of targeted actives in a lightweight base. An ampoule is simply a more concentrated serum, typically used as a short-term treatment course. This is where you address specific concerns: niacinamide for pores and tone, vitamin C for radiance and antioxidant protection, retinol for cell turnover and collagen synthesis (PM only), or peptides for barrier repair. Layer from thinnest to thickest, and never mix vitamin C with niacinamide in the same step — apply them at different times of day to avoid potential interaction.

Look for: Niacinamide, vitamin C, retinol, peptides, adenosine

Sheet masks deliver actives under occlusion — the physical barrier of the mask prevents evaporation and forces ingredients into the skin. Clinical studies show that occluded application increases ingredient penetration by up to 10× compared to open-air application. The 15–20 minute window is optimal; beyond 30 minutes, the drying mask begins to draw moisture back out. After removal, press the remaining essence into skin with palms — never rinse. Sheet masking is not a luxury add-on; it is one of the most efficient delivery mechanisms in the routine.

Look for: Hyaluronic acid, ceramides, centella asiatica, fermented extracts

The periorbital skin is the thinnest on the face (0.5mm versus 2mm elsewhere) and has fewer sebaceous glands, making it more prone to dehydration and the first area to show signs of ageing. Eye creams are formulated at lower concentrations of actives and with gentler delivery systems than face serums, making them appropriate for this sensitive area. Apply with the ring finger — the weakest finger — using a gentle tapping motion rather than rubbing. Look for caffeine (reduces puffiness by constricting blood vessels), peptides (support collagen), and ceramides (restore barrier).

Look for: Caffeine, peptides, ceramides, retinol (PM formulations)

The moisturiser seals the hydration stack. An effective moisturiser contains all three functional components: humectants (glycerin, HA) to attract water, emollients (ceramides, fatty acids, squalane) to fill gaps in the barrier, and occlusives (petrolatum, dimethicone) to prevent evaporation. Korean moisturisers tend to be lighter than Western equivalents — gel-creams and water-creams are common — because the hydration has already been built up through the preceding layers. Apply while skin is still slightly damp from the previous step.

Look for: Ceramides, glycerin, squalane, centella asiatica, madecassoside

In the morning, SPF is non-negotiable. UV radiation is the primary driver of premature ageing, hyperpigmentation, and barrier degradation — and the single most evidence-backed preventive skincare intervention available. Korean sunscreens are formulated to be lightweight, non-greasy, and genuinely enjoyable to wear, removing the most common barrier to daily use. At night, a sleeping mask — a thick, occlusive cream or gel applied as the final step — works while you sleep to repair the barrier and lock in the night's treatment. Skin cell turnover peaks between 11pm and 4am, making the PM routine the most impactful.

Look for: AM: zinc oxide, tinosorb S/M, uvinul A plus | PM: shea butter, ceramides, peptides