A serum is a lightweight, fast-absorbing treatment formulated with a high concentration of active ingredients. It targets specific skin concerns such as dehydration, dullness, fine lines, or pigmentation. In Korean skincare, serums are the powerhouse step — applied after toner and before moisturizer — to deliver visible improvements to the skin over time.

What’s the Difference?

Think of it like this:

• Essence is for hydration and prepping — light, foundational.

• Serum is your daily treatment — focused and effective.

• Ampoule is your intensive booster — powerful and occasional.

All three can work in harmony, layered from lightest to richest, for skin that looks and feels its best.