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Derma Factory held Coupang's skincare #1 on every day we read

Last week three brands took turns at #1 on Coupang's skincare chart. This week there was no turn-taking: Derma Factory's Niacinamide 20% Serum was #1 on all seven days we captured, and on six of them the brand held three of the top five places.

7 of 7
captured days Derma Factory's Niacinamide 20% Serum was Coupang's skincare #1
3 of 5
top-five places Derma Factory held on six of the seven days — the serum, its two-pack, and its Retinal 300ppm Cream
6 of 7
days MEDI-PEEL's Melanon X Cream was also in the top five, usually at #2
Grid of Coupang's skincare top 5 on each of seven captured days from Oct 11 to Oct 19, 2026, with Derma Factory highlighted. Derma Factory's Niacinamide 20% Serum is #1 in every column.
Coupang skincare top 5 by day, Oct 11–19 (KST, seven days captured). Derma Factory highlighted.

Coupang is Korea's everything store. Its skincare best-seller list moves daily, so we read it every day and report the days we could verify.

One serum on top

Fact. Derma Factory's Niacinamide 20% Serum (30ml) was #1 on Oct 11, 12, 13, 15, 17, 18 and 19 — every day we captured. The week before, #1 went from TONYMOLY to WELLAGE to Derma Factory.

Three places at once

Fact. On six of the seven days Derma Factory had three listings in the top five: the serum, the same serum sold as a two-pack, and its Retinal 300ppm Cream. MEDI-PEEL's Melanon X Cream was in the top five on six days. Observation. A single-pack and a two-pack of one product rank separately on Coupang, so one formula can fill two places. Inference. On Korea's mass online shelf the steadiest seller is again a product named for one active at a stated strength — the pattern we flagged last week, now without a gap.

How to read this

Seven days captured (Oct 14 and 16 are missing; days without a verified capture are skipped, not filled). Sizes and bundles of one product are listed separately by the retailer and we show them separately. Daily chart position, not sales.

Receipt: every number above is checkable against the 2026-W43 archive · method on /methodology. Coupang skincare category best-sellers, top 5, captured Oct 11, 12, 13, 15, 17, 18 and 19, 2026 (KST); Oct 14 and 16 not captured. Product-level detail is shown for Korea's own retailer. Chart position, not sales.
Cite this ↓

"Derma Factory held Coupang's skincare #1 on every day we read" — kbeautytmi, 2026-W43. https://kbeautytmi.com/stories/derma-factory-held-coupangs-skincare-no1-every-day-2026-w43

↗ Chart image — free to use with credit Free to cite — rankings can't be collected retroactively, so this archive exists nowhere else.
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