Short verdict
Skip. Usually not worth luggage space, shipping cost, or the risk of buying before you know whether you need it.
A bestseller is a signal, not a verdict. Check skin compatibility, seller route, shipping cost, and whether the product solves a real problem for you.
What to know
Buy in Korea if you can test texture, compare shades, or pick up a small trial size before committing.
What to avoid
Skip bulk hauls based only on ranking screenshots, especially if you have sensitive skin or cannot easily return international orders.
Final verdict: use bestsellers as a shortlist, not a shopping cart.