Hanluvi — The Korean skincare routine (K-beauty): the | hanluvi.com

What order do I apply Korean skincare products?

Thinnest to thickest: oil cleanse, water cleanse, toner, essence, serum, moisturiser, then SPF in the morning.

The logic is texture: each layer should be thinner than the one that follows it, so light watery products absorb before heavier creams seal them in. Numbered as a full template, the routine runs to ten steps, and the first two are the double cleanse — an oil or balm cleanser to dissolve sunscreen and sebum, then a water-based cleanser to lift sweat and water-soluble dirt.

Not every step happens every day. Exfoliating acids sit at step 3 but only two or three nights a week, and the sheet mask at step 7 is a single-use extra worn for 10-20 minutes — most packs say 15 — on mask days. The skeleton that repeats daily is cleanse, toner, serum, moisturiser, and sunscreen.

Timing matters at the ends of the sequence. Sunscreen is always the last morning step, and in sun it is reapplied every 2 hours. Retinol, when it appears at the serum step, belongs to the evening, and starters should expect about 12 weeks of nightly use before judging it.

• Step 1 — Oil or balm cleanser: the first half of the double cleanse, melting sunscreen and long-wear makeup. Typical failure: skipping it on heavy-SPF days.
• Step 2 — Water-based cleanser: lifts sweat and water-soluble grime. Typical failure: a formula above pH 7 that leaves skin tight.
• Step 3 — Exfoliant, two or three nights a week: leave-on BHA at 0.5-2%. Typical failure: daily use and a raw, over-exfoliated barrier.
• Step 4 — Toner: a hydrating layer that dampens skin for what follows.
• Step 5 — Essence: a light treatment layer between toner and serum.
• Step 6 — Serum or ampoule: where the actives live — niacinamide, vitamin C or retinol at the strengths in the table below.
• Step 7 — Sheet mask on mask days: 10-20 minutes, single use; most packs say 15. Typical failure: leaving it on until it dries.

Why the second cleanse has a pH rule

Skin sits at pH 4.5-5.5, and a cleanser above pH 7 works against it.

Healthy skin surface sits at pH 4.5-5.5, kept there by the acid mantle — the thin film that holds moisture in and irritants out. Cleansers formulated above pH 7 push against that acidity, disrupt the mantle and slow the barrier's recovery after washing.

The practical symptom is the 'squeaky clean' feeling: tight, dry skin within minutes of washing. That tightness is not cleanliness; it is a stripped barrier, and every product applied afterwards has to work harder on compromised skin.

The double cleanse exists partly to solve this. Because the oil or balm step does the heavy lifting on sunscreen and makeup, the water-based second cleanse can be a gentle low-pH formula that finishes the job without dragging the surface out of its 4.5-5.5 comfort zone.

Where each active fits in the line-up

The serum slot — step 6 — is where every active in this guide is applied.

Vitamin C as L-ascorbic acid is typically dosed at 10-20% and performs best in formulas below pH 3.5, which is why it goes onto freshly cleansed skin in the serum slot — most people give it the morning, where it sits under sunscreen.

Niacinamide is the flexible one: serums commonly run 2-5%, with stronger leave-on products at 10%, and it layers in either the morning or evening slot. Retinol is the evening specialist — starters use 0.25-0.5%, step up to 1% only when tolerated, and allow about 12 weeks of nightly use before judging results.

BHA (salicylic acid) works one step earlier, at the exfoliant slot: leave-on products are formulated at 0.5-2%, while rinse-off washes run milder at 0.5-1%. Two or three nights a week is the standard cadence, and retinol nights and BHA nights are best alternated rather than stacked.

• Vitamin C: morning serum slot, 10-20% L-ascorbic acid formulated below pH 3.5.
• Niacinamide: morning or night, 2-5%; 10% versions for skin already used to actives.
• Retinol: night only, start at 0.25-0.5%, step up to 1%; judge after about 12 weeks.
• BHA: two or three nights a week at step 3, 0.5-2% in leave-on form.