Repurchase / loyalty
An extremely high number of reviewers explicitly state this is their 2nd-20th+ repurchase and that they 'always repurchase' or have used it for 2-4+ years, indicating strong retention.
Reputation as a Korean bestseller
Many buyers reference it as 'South Korea's national sunscreen' or the '#1 seller,' buying based on its viral/best-seller status and word of mouth.
Suitability for sensitive/acne-prone skin
Numerous reviewers with sensitive, rosacea-prone, or acne-prone skin say they researched extensively before buying because most sunscreens irritate them, and chose this one for its gentle reputation.
Value of the triple set format
Reviewers frequently cite the 3-pack bundle as 'great value,' allowing stockpiling for daily year-round use or for sharing with family/friends/coworkers.
Gifting
Several buyers purchased extra units specifically as gifts for family, coworkers, or friends after personally loving the product.