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Round Lab Birch Juice Moisturizing Sunscreen and Beauty of Joseon Relief Sun: Rice + Probiotics are two of the most talked-about Korean sunscreens. Round Lab’s Birch Juice sunscreens were the focus of a brand livestream in Thailand in early November 2026, and Beauty of Joseon turns up in most “what sunscreen do you use” threads. On paper they are closer than most people expect.
We compared the published ingredient lists, the Mirai listings and prices. We did not wear-test either sunscreen.
Product photo: Mirai Skin listing for Round Lab Birch Juice Moisturizing Sunscreen.
Quick comparison
| Round Lab Birch Juice Moisturizing Sunscreen | Beauty of Joseon Relief Sun: Rice + Probiotics | |
|---|---|---|
| Label | SPF 50+ PA++++, 50 ml | SPF50+ PA++++, 50 ml |
| Price at Mirai (9 Nov 2026) | $25.31 | $24.95 |
| UV filters (INCIDecoder list) | Diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, methylene bis-benzotriazolyl tetramethylbutylphenol, diethylhexyl butamido triazone | The same four |
| Filter type | All organic (chemical) filters, no zinc oxide or titanium dioxide | All organic (chemical) filters, no zinc oxide or titanium dioxide |
| Skincare extras | Birch juice (1,425 ppm), sodium hyaluronate and hyaluronic acid, niacinamide, allantoin, dipotassium glycyrrhizate | Rice extract, niacinamide, rice germ extract, green tea, several lactobacillus and rice ferments |
| Essential oil or fragrance listed | Anthemis nobilis (chamomile) flower oil | None listed |
| Who it suits | Dry or normal skin that likes a moisturizing sunscreen and is fine with a botanical oil | Most skin types, especially if you avoid essential oils |
Ingredient lists: Round Lab on INCIDecoder (uploaded October 2023) and Beauty of Joseon on INCIDecoder (uploaded as the 2025 version). Both brands have changed these formulas over the years, so check the box you receive.
The UV filters are the same
This is the part most comparisons miss. On the lists above, both sunscreens use the same four filters, in nearly the same order near the top of the list:
- Diethylamino hydroxybenzoyl hexyl benzoate (sold as Uvinul A Plus), a UVA filter.
- Ethylhexyl triazone (Uvinul T 150), a UVB filter.
- Methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb M), a broad-spectrum filter.
- Diethylhexyl butamido triazone (iscotrizinol), a UVB filter.
The bases look alike too: water, dibutyl adipate, propanediol, polymethylsilsesquioxane, coco-caprylate/caprate and caprylyl methicone appear high on both lists. Neither contains zinc oxide or titanium dioxide, so neither is a mineral or hybrid sunscreen. Some comparisons online describe Relief Sun as a hybrid. The current list doesn’t support that. (For Beauty of Joseon against a SKIN1004 sunscreen, see Beauty of Joseon Relief Sun vs SKIN1004 Centella Sun.)
Same filters on a list doesn’t prove identical protection, because concentrations aren’t published. Both carry the same SPF50+ PA++++ label. Protection depends far more on how much you apply: the American Academy of Dermatology recommends enough to cover all exposed skin and reapplying about every two hours outdoors, or sooner after swimming or sweating.
Where they differ: the extras
Round Lab builds the formula around its Birch Juice line. The list shows birch juice at 1,425 ppm (about 0.14%), plus two forms of hyaluronic acid, glyceryl glucoside, allantoin and dipotassium glycyrrhizate. It also lists chamomile (anthemis nobilis) flower oil, an essential oil, along with pine leaf and artemisia annua extracts. The Mirai listing describes a moisture-essence texture with no white cast.
Beauty of Joseon builds around rice. The 2025 list includes rice extract, rice germ extract, green tea and a run of ferments (lactobacillus/rice ferment, saccharomyces/rice ferment filtrate and others). No essential oil or fragrance appears on it. Older uploads put rice extract (30%) second on the list; the 2025 upload starts with water and lists rice extract lower. The Mirai listing calls the finish lightweight and hydrating.
Both list niacinamide.
Price and size
Both are 50 ml. At Mirai on 9 November 2026, Round Lab was $25.31 and Beauty of Joseon was $24.95, so about $0.50 per ml each. Beauty of Joseon also comes as a double pack for $44.95, which brings it to about $0.45 per ml.
Who should pick which
Choose Beauty of Joseon Relief Sun if:
- You avoid essential oils or fragrance in leave-on products.
- You want the slightly cheaper option, or a double pack.
- You like the rice and ferment extras.
Choose Round Lab Birch Juice if:
- You already use Round Lab’s Birch line and want a matching sunscreen.
- Your skin is dry or normal and you want hyaluronic acid in the sunscreen step.
- Chamomile oil doesn’t bother your skin.
Oily skin? Neither is sold as a matte sunscreen. If you want less shine, see the Korean sunscreens for oily skin guide, or Beauty of Joseon’s lighter Relief Sun Aqua-fresh ($25.95 at Mirai). For breakout-prone skin, see Korean sunscreens for acne-prone skin.
Patch-test any new sunscreen on a small area for a few days before using it on your whole face.
How to remove them
Both are water-and-silicone sunscreens with oil-soluble filters. An oil cleanser followed by a gentle second cleanser removes them well. See the best Korean cleansing oils and SKIN1004 vs Anua cleansing oil. If you run outdoors, Rooted Glow’s sunscreen for running guide covers sweat and reapplication.
Browse all Korean sunscreens at Mirai
Frequently asked questions
Are Round Lab Birch Juice and Beauty of Joseon Relief Sun the same formula?
No. On the ingredient lists we checked they share the same four UV filters and a very similar base, but the extras differ: Round Lab adds birch juice, hyaluronic acid and chamomile flower oil, while Beauty of Joseon adds rice extract and ferments.
Which is better for sensitive skin?
Beauty of Joseon lists no essential oil or fragrance, while Round Lab lists chamomile flower oil. If essential oils irritate your skin, Beauty of Joseon is the safer starting point, but patch-test either one.
Are they mineral or chemical sunscreens?
Both are chemical (organic-filter) sunscreens. Neither lists zinc oxide or titanium dioxide.
Do they leave a white cast?
Neither uses mineral filters, which are the usual cause of white cast, and both listings say no white cast. Results vary with how much you apply and your skin tone.
Which one is cheaper?
At Mirai on 9 November 2026, Beauty of Joseon was $24.95 and Round Lab was $25.31 for 50 ml each. The Beauty of Joseon double pack lowers the price per ml.
How much sunscreen should I use?
Enough to cover all exposed skin. For the face and neck, many people use about two finger-lengths. Reapply about every two hours outdoors, and after swimming or sweating.
Sources
- Round Lab Birch Juice Moisturizing Sunscreen ingredient list, INCIDecoder: https://inkeedecoder.com/products/round-lab-birch-juice-moisturizing-sunscreen-spf-50-pa
- Beauty of Joseon Relief Sun: Rice + Probiotics (2025) ingredient list, INCIDecoder: https://inkeedecoder.com/products/beauty-of-joseon-relief-sun-rice-probiotics-spf50-pa-2025
- American Academy of Dermatology, Sunscreen FAQs: https://www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/sunscreen-faqs
- Product details and prices: the Mirai Skin listings linked above, checked 9 November 2026.
