mixsoon - Bean Sun Serum SPF 50+ PA++++ 50ml

mixsoon Bean Sun Serum SPF 50+ PA++++ — a Korean sunscreen with no white cast

Built as a serum, not a cream. It goes on like a skincare step rather than a chore, sits under makeup, and does not leave a grey cast. Fermented plant extracts — the same mixsoon bean idea as Bean Essence — sit underneath it. 50ml.

What does PA++++ mean?

SPF measures protection against UVB — the burning wavelength. PA measures UVA — the one that goes deeper and does the slow, cumulative damage you do not feel happening.

PA++++ is the top of the Asian rating scale. A sunscreen with a high SPF and a weak PA rating is half a product. This is not one.

The serum texture is the point

The best sunscreen is the one you actually put on every morning — which is a texture problem far more than a chemistry problem. Nobody skips SPF because they disagree with dermatology. They skip it because it was greasy, or it pilled, or it turned them grey in photographs.

How much sunscreen should you use?

More than you think — roughly two finger-lengths for face and neck. Most people apply about a third of what the rating is measured with, which quietly turns SPF 50 into something far lower. Under-application is the single most common reason sunscreen underperforms.

And reapply. A single morning application is worn down by hours, sweat and your own hands long before evening, and no SPF number changes that. Over makeup that is awkward with a serum — which is what the Bean Sun Stick is for. Serum in the morning, stick in your bag: that is the pair.

Which mixsoon sunscreen should you buy?

Bean Sun Serum — this one. Serum texture, under makeup, 50ml, the daily one.
Bean Sun Stick — reapplication over makeup, 15g.
Cica-Hyal Sun Stick — the stick with centella.
Centella Suncream — a cream for sensitive skin.
Shield Fit Pure Sun Cream — non-nano mineral filters.

Where it fits

Last step of the morning, after essence and cream, before makeup. At night, take it off properly — Bean Cleansing Oil is built for exactly that, because a water-based cleanser will not fully remove it.

Shop more in Korean sunscreen, sun damage and pigmentation, or mixsoon. Read the best Korean sunscreens of 2026.

Frequently asked questions

What does PA++++ mean?
It is the UVA rating — four plusses is the highest on the scale. SPF only covers UVB. You want both.

Does mixsoon Bean Sun Serum leave a white cast?
No. It finishes clear and sits under makeup — which is the entire argument for a serum format.

How much sunscreen should I use?
Roughly two finger-lengths for face and neck. Under-application is why sunscreen underperforms.

How do I reapply over makeup?
You do not, with a serum. That is what the Bean Sun Stick is for.

Where can I buy authentic mixsoon sunscreen in the USA?
At K-Touch. Authentic, sourced from verified distributors, carefully stored and securely packaged, with secure checkout and order tracking.