Brand trust/reputation
Many reviewers say they buy 'because it's Torriden' or already loved the brand's other masks (especially the blue Dive-In), treating this as a safe extension purchase.
Word-of-mouth and social proof
Several reviews mention hearing 'so many good things' about the product or that it's popular in Korea, and one references a celebrity (TWICE Sana) using it.
Sale/discount pricing
A large number of purchases were made during OliveYoung mega-sale or coupon promotions, with reviewers citing good value at roughly $2/sheet for a 10-pack.
Repurchase for skin flare-ups
Many long-term users repurchase specifically to keep as a 'stock item' for when skin becomes irritated, breaks out, or feels sensitive.
Gift/family use
Some buyers purchased for friends, family members, or teens, citing gentle, low-risk formulation as suitable for sharing.