Repeat purchase / brand loyalty
An extremely high number of reviewers explicitly mention repurchasing multiple times or buying in bulk (10-50pcs) whenever on sale, indicating strong retention.
Word-of-mouth and social proof
Many buyers cite hearing about the mask's popularity from friends, social media, or general 'good reviews' before trying it themselves.
Sale/discount pricing
Several reviews mention buying during Olive Young sales events (Big Ban, Black Friday) or with coupons, showing price sensitivity drives purchase timing.
Gift-giving
Multiple reviewers purchased the mask as gifts for mothers, daughters, or friends, or received it as a gift before buying it themselves.
Ingredient/brand reputation (galactomyces, fermented essence)
Some reviewers reference the fermented essence or galactomyces ingredient reputation as a reason for trust, especially existing numbuzin serum users.