Korean and Japanese sunscreens can use UV filters the FDA still hasn't approved. This routine is built around protection, with brightening and barrier work everywhere else.
The minimum routine. Skip nothing here.
Daily AM gel cleanser
Niacinamide · brightening
Birch sap · lightweight
SPF 50 · daily hero
Optional add-ons. Each has a "when to add" trigger, none are daily-use unless the trigger fits.
Mineral · light hydration
When to add: add for lightweight prep before serum
Vitamin C + niacinamide · brightening
When to add: add for compounding brightening (vitamin C + niacinamide stack)
SPF50+ · J-alternative · water-resistant
When to add: add as alternate SPF for beach or water-resistant days