Brand loyalty / repurchase
Many reviewers say they have used multiple Mediheal toner pad lines (Madecassoside, Collagen, etc.) and bought PDRN as a natural extension, often noting it's their 2nd or 3rd repurchase.
Bundled portable travel case
A very large share of buyers state the free/included travel case was a major or even primary reason for purchase, especially frequent travelers.
Trending PDRN ingredient
Reviewers, particularly in Chinese and Japanese, mention buying because PDRN is currently a trending/popular ingredient in Korean skincare.
Influencer/word-of-mouth recommendation
Several reviews cite recommendations from beauty YouTubers, in-store OliveYoung staff, or Korean idols/influencers as the trigger for trying the product.
Value/promotion pricing
Many buyers mention purchasing due to double-pack deals, discount coupons, or sales events making the set feel like good value.