Seoullit is published under the pen name Jungyeon Schofield Sullivan Kim. It is run by a Korean husband and a British wife, and our About page has more about the two of us.
What we cover, and what we don’t do
Seoullit is about Korean sunscreen: what is in a formula, which UV filters it uses, how sunscreen is regulated in Korea and the US, and everyday questions such as how much to apply. We also make free calculators and quizzes, collected on our Tools page.
We don’t give medical advice. Neither of us is a dermatologist. Our Medical Disclaimer lists when to see a professional. We don’t wear-test products, run lab tests or take product photos.
How we use AI
Our articles are made with the help of AI tools. They help us research topics, write and check drafts, and translate Korean sources.
The two of us choose the topics, set the editorial rules that the tools and checks follow, and decide what is published.
Every new article goes through automated checks before it is published. Some of the checks are scripts. Others are separate AI agents that did not write the article. Between them, they compare the article’s quotes, numbers, ingredient positions and links against the original sources: for example, whether the translation of a quoted review matches the original, or whether an ingredient is where the article puts it on the list. The checks don’t catch everything; the section on corrections below covers what happens then.
The sources we read
Our reviews, and most of our “best” lists, are built on the ingredient list. We read it in the order it is printed and look at where the UV filters and headline ingredients fall. If a product has several listings or versions, for example a Korean and a US formula sold under one name, we try to say which one we read.
Alongside the ingredient list, we use:
- brand pages and retailer listings, such as a brand’s own Korean store or Olive Young, which often print the full ingredient list;
- ingredient databases such as INCIDecoder (now called INKEEDecoder);
- regulator records, such as notices from Korea’s Ministry of Food and Drug Safety (MFDS), US FDA rules and the sunscreen labels published on DailyMed;
- published studies;
- Korean user reviews, mostly from Naver blogs.
When we quote a Korean review at length, it goes in its own box: the English translation on top, the original Korean underneath, and a link to the post it came from, so anyone who reads Korean can check it. Most articles end with a list of their sources, with links.
What “review” and “best” mean here
A review on Seoullit is a close reading of one product, or of one brand’s sunscreen line: the full ingredient list, the UV filters and where they sit, which version is sold where when that matters, and what Korean users report when we can find reviews worth quoting.
A “best” list is usually a shortlist for one need, such as sunscreen for oily skin or for reapplying over makeup. The picks rest mainly on their labels, their listings and what reviewers report.
Neither kind of article is based on our own wear testing, and skin varies, so take what an article says about finish or feel as general guidance.
Affiliate links and ads
Seoullit may show display ads served by Google AdSense, and some articles contain Amazon affiliate links, which may earn us a commission if you buy through them. Most articles have no affiliate links. Our Affiliate Disclosure says how they are marked.
An affiliate link has to lead to the formula the page describes. The same product name can mean a different formula in another country, so a link can end up at the wrong version. When we find one like that, we remove or replace it. In October 2026, for example, we removed links that went to the US version of a product whose formula differs from the Korean version a page covers, as our Corrections Policy notes.
Corrections and updates
If you spot a mistake, write to us at contact@seoullit.com or use our Contact page. Our Corrections Policy explains how we check a report against the original source and fix the same mistake wherever else it appears.
Pages also change when the facts behind them change. When we learn that a brand has reformulated a product, we update the pages that describe the old formula.
Last updated: October 2026.