Glow Deep Serum: Rice + Arbutin

Alpha-arbutin works by inhibiting tyrosinase, the enzyme skin needs to produce melanin, which makes it a gradual, low-irritation option for dark spots and uneven tone; niacinamide supports the same goal while strengthening the barrier. The base — 68.6% rice bran water — gives the light, watery serum a hydrating, subtly glowy feel. Beauty of Joseon recommends using it in the evening, since arbutin is sensitive to light and heat. Apply after toner and before moisturizer; expect visible change over weeks to months, not days. Daily sunscreen is non-negotiable while treating pigmentation — without it you're undoing the work. It's gentle enough for sensitive skin, but patch test as with any active.