Existing brand loyalty
Many reviewers are repeat SKIN1004 customers who bought this new ampoule specifically because they already trust the brand's centella line and wanted to try 'every type' (niacinamide, retinol, madecassoside).
Promotional pricing / sales
A very large share of purchases were triggered by Olive Young sale pricing, with reviewers repeatedly noting 'bought because it was cheap/on sale' and buying multiples to stock up.
Ingredient reputation (niacinamide + spicules)
Buyers were drawn to the 10% niacinamide concentration and the spicule/microneedle technology, comparing it to popular 'reedle shot' style products and wanting the pore/brightening benefits.
Positive reviews and rankings
Several reviewers mention purchasing because the product or brand was ranking highly or trending on Qoo10/Olive Young, or because prior reviews looked good.
Repurchase / gifting
A notable number of reviews are second or third bottle repurchases, and some buyers purchased it as a gift for a boyfriend, daughter, or friend.