Olive Young mega sales and discounts
Many reviewers explicitly mention buying or stocking up because of seasonal sales, bundled freebies, or discount events, indicating high price sensitivity and promotional responsiveness.
Influencer and word-of-mouth recommendation
Several buyers cite favorite influencers or friends recommending the mask, especially for pore care and brightening variants, as their reason for trying it.
Repeat/loyalty purchase
A very large share of reviews are explicit repurchases, with some customers saying they have used it daily or reordered it for over a year, showing strong brand loyalty.
Numbered system matched to specific skin concerns
Buyers like being able to choose No.1 through No.5 based on their specific need (hydration, pores, brightening, soothing), which several reviewers say is 'convenient' and drives them to collect the whole set.
Ingredient reputation (vitamin C, glutathione, panthenol, mugwort)
Mentions of these actives, especially the glutathione/vitamin C in No.5 and panthenol/mugwort in the calming variants, are cited as reasons for choosing a specific number.