Companion product loyalty
Many buyers purchased the serum after already loving the Madecassoside toner pads or sheet masks from the same line, wanting a matching product for their routine.
Ingredient reputation (Madecassoside/Niacinamide)
Reviewers frequently cite trust in centella/madecassoside for soothing and niacinamide for brightening/sebum control as a key reason to buy.
Influencer/word-of-mouth recommendation
Several reviews mention purchasing after seeing recommendations from Korean YouTubers, TikTok, or friends who praised the product.
Repurchase/holy grail status
A large number of reviews are explicit repurchases, some citing 3rd, 5th, or 10th bottle purchases, showing strong retention.
Value bundle pricing
The 2-bottle + sheet mask set at sale price is repeatedly called a great deal ('CP值高', 'お得'), driving purchase during promotions.