Korean Serum: what it is & do you need it 세럼
Your targeted treatment — a concentrated dose of one or two actives for a specific concern (brightening, calming, firming).
At a glance
Do you need it?
recommended If you have a concern you actually want to address, this is the step that does the work. Choose by goal, not by hype.
Choose by concern
Choose by skin type
Explore more K-beauty guides →🙋 People also ask
What is the difference between essence and serum?
In Korean skincare, essence is typically a thinner, hydration-focused layer that preps skin, while serum is more concentrated with targeted actives like vitamin C or niacinamide. Essence usually comes first; serum follows. The line between them blurs, and not every routine needs both.
Do you really need all 10 steps of Korean skincare?
No. The 10-step routine is a menu, not a requirement. Many Koreans use a simple core of cleanser, hydrating toner, moisturizer and sunscreen, adding serums, essences or masks only as their skin needs. The point is consistency and customization, not maximum steps.
Do I really need to double cleanse?
At night, if you wear sunscreen or makeup — yes. Water-based cleansers cannot break down water-resistant sunscreen, so a single cleanse leaves a film behind. In the morning, one gentle cleanse or just water is plenty.
What is a first essence and do I need one?
A first essence is a watery, high-percentage ferment applied straight after cleansing, before anything else. It is a hydration and conditioning step. Pleasant and popular, but genuinely optional.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-10.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.