Short verdict
Buy in Korea. Best purchased during a Korea trip, usually because of local access, price, testing, or limited bundles.
Skincare sets look efficient, but they often include products you would not buy individually. Treat the set as a bundle of decisions.
What to know
Buy in Korea when you can compare set sizes, limited bundles, and samples in person. Buy online for reorders of a set you already know.
What to avoid
Skip large sets if you are new to the brand, have sensitive skin, or only want one product in the bundle.
Final verdict: sets are best after you know the hero product works for you.