The 10-step routine addresses only a few of the functional gaps that each skin type has, and this is true for every type of skin. Adding product volume for concerns these profiles don’t have will only exacerbate their problems. Korean Beauty built this as a layered system where each step serves a different function. The issue is that not every profile has the same gaps this system was put together to address. Oily types are already producing more surface lipid than needed. Sensitive types react before the product even settles. Reactive types cannot hold up under ten back-to-back applications. Those already within a balanced barrier range see no return from the full sequence and often end up with texture shifts or flares from the product volume alone.

1. Oil cleanser – Oil cleanser removes surface oil and daily build-up on the skin, but on skin that is already heavily slick with sebum, the extra oil contact can cause breakouts.
2. Water-based cleanser – Removes what the first cleanse left behind, but daily use of two cleaners gradually breaks down the lipid barrier, resulting in dry and sensitive skin types becoming more reactive as a result.
3. Exfoliator Exfoliates the surface and removes dead cells, but if it’s used regularly on reactive skin or thin skin, it tears down the barrier too fast, so skin sensitivity increases rather than texture improves, and the barrier breaks down more quickly than it can be rebuilt.
4. Toner – Brings balance back after cleansing, but alcohol-containing products hit sensitive skin hard on contact, drying them out and pushing them to produce more oil to compensate.
5. Essence – Puts a hydration layer down for types running dry or dull, but where moisture is already sitting at a good level, it just adds weight on top with nothing changing underneath.
6. Serum or ampoule – Sends concentrated actives straight at a specific concern, but if used on a profile that does not carry that concern, it only raises the chance of irritation with no useful output.
7. Sheet mask – Has its place as an occasional deep hydration session, but daily use on a type that does not need that level of input clogs the surface and throws off the skin’s own balance.
8. Eye cream – Made specifically for the area around the eyes, but for younger types with no dryness or pigmentation sitting in that zone, putting a dedicated product there every day gives nothing back.
9. Moisturiser – Holds everything applied before it in place, but laid over five or six products already sitting on the surface, oily and combination types cannot move through that weight, and congestion follows.
10. SPF – Blocks ultraviolet damage across every profile, no matter which other steps are skipped, standing as the only step in the full sequence that applies without condition to everyone.

A routine shaped around what is actually present in a given profile will always do more than a full sequence followed without checking whether each step is serving any real purpose there.