You don't have to pick one. Smart shoppers use both, and here's the split that works:
- Daiso is where you go for cheap and small. Sheet masks for a few hundred won, travel-size minis, brushes, sponges, hairbands, and a short list of skincare dupes that genuinely punch above their price. Almost everything is ₩1,000 to ₩5,000.
- Olive Young is where you go for range and real formulas. The brand you actually saw on TikTok, the full-size hero product, the latest serum that launched last month, frequent 1+1 (buy-one-get-one) deals, testers you can swatch, English-speaking staff in the big stores, and a tax refund on your passport.
If your budget is tiny and you want masks and gadgets, Daiso wins outright. If you want a specific viral product, a premium brand, or the best price-per-milliliter on a full size after deals and tax refund, Olive Young usually wins. Most people leave Korea having hit both — and that's the right call.