Discount/sale pricing
Many reviewers explicitly say they bought it because it was on sale or heavily discounted, especially during Olive Young 'big sale' events, and consider it a bargain for a two-bottle set.
Double-set value
The 120mL x 2 format is frequently cited as a reason to buy, with reviewers noting it lasts a long time, is good for sharing/gifting, or is a good stock-up item.
Brand trust and repurchase
Numerous reviewers say they trust the numbuzin brand overall or have repurchased this cleanser multiple times (some mention 3rd, 4th, even 20th purchase), indicating strong repeat-buy behavior.
Word of mouth / social proof
Several buyers mention hearing 'good things' about the product before trying it, or being recommended it by friends, family members, or officemates.
Pairing with other numbuzin products
Some reviewers bought it specifically to use as a second cleanser after the numbuzin oil cleanser or alongside other numbuzin skincare items.