Gentle alternative to harsh vitamin C
Many reviewers specifically sought a vitamin C product after reacting badly to other high-concentration or L-ascorbic acid serums, choosing this one for its reputation as low-irritation.
Repeat purchase / brand loyalty
A large share of reviews mention this being their 3rd-10th bottle, and loyalty to the Torriden brand (especially the Dive-In serum line) drove trial of this product.
Influencer/YouTuber recommendation
Several buyers cite YouTubers, Instagram influencers, or word-of-mouth/hot reviews as the reason they tried the product for the first time.
Value of the 2-bottle set and sales
The double-set format and frequent Olive Young sale pricing (often cheaper than Qoo10 or Korean retail) was repeatedly cited as a purchase driver, with buyers splitting the set with family or partners.
Sample-to-purchase conversion
Multiple reviewers received a sample first (in-store or with another Torriden product) and liked the texture enough to buy the full-size set.