Reputation for soothing sensitive/reactive skin
Many buyers purchased specifically because of centella's known calming reputation, often after seeing it recommended for rosacea, redness, or retinol-irritated skin.
Repeat purchase / restocking
A very large share of reviews mention repurchasing 2nd, 3rd, or even 8-10th bottles, indicating strong repeat-purchase behavior once tried.
Influencer and word-of-mouth recommendation
Several reviewers explicitly say they tried it because 'influencers' or friends recommended it online.
Sample-to-full-size conversion
Multiple reviews describe receiving a sample from Olive Young events and then buying the full 100ml bottle after liking it.
Price-to-volume value
Reviewers frequently note the large 100ml size is affordable relative to competing ampoules, calling it good 'CP' (cost-performance).