Repurchase / brand loyalty
Many reviewers state this is a repeat buy or that they trust Round Lab as a brand, often stocking up during sales or after trying a single sheet first.
Ingredient/brand reputation (Cica, Round Lab)
Reviewers cite Round Lab's cica line and natural ingredient reputation, often having used the brand's ampoule, toner pads, or cream before trying the mask.
Sale/discount pricing
Several buyers explicitly mention purchasing because of a sale or reasonable price, often buying multi-packs when discounted.
Gifting
Multiple reviewers bought the mask as a gift for friends or family, and some Japanese reviews mention buying as omiyage (souvenir).
Recommendation / word of mouth
Some reviews mention being recommended by an influencer ('director Pi') or by friends/family who found it effective.