The full Korean PM routine comes in modules: five core layers (oil cleanse, gel cleanse, hydrating toner, serum, sleeping mask) plus up to three extras when you have time. Five layers takes seven minutes; eight takes twenty.
The minimum routine. Skip nothing here.
Step 1: oil cleanse · removes makeup/SPF
Step 2: gel cleanse · daily
Step 4: hydrating toner · daily
Step 6: ampoule/serum · niacinamide
Step 7b: sleeping mask · seal
Optional add-ons. Each has a "when to add" trigger, none are daily-use unless the trigger fits.
Step 3: exfoliating toner · 2-3× weekly only
When to add: add 2-3× weekly between cleansers; never daily
Step 5: essence · plumping
When to add: add as plumping hydration layer after toner
Step 7a: eye cream · pat in
When to add: add as concentrated eye step before the sleeping mask