Brand reputation / makeup artist credibility
Reviewers repeatedly cite trust in the JSM name itself ('정생물이라 믿고 사요', 'ジョンセンムルは間違いない') as a primary reason for purchase, treating the brand as a mark of quality.
Repurchase and collecting behavior
A large share of reviewers say they already own other JSM brushes and are buying more to 'complete the set,' suggesting strong loyalty and multi-SKU purchasing patterns.
Influencer/YouTube tutorial recommendation
Several Japanese-language reviews mention seeing the brush recommended in JSM's own YouTube tutorials before buying, indicating branded content drives conversion.
Softness and quality relative to price
Buyers frequently mention purchasing because the bristles look/feel 'luxurious' or 'high quality' and feel the price is justified compared to cheaper alternatives.
Gifting
At least one reviewer purchased a concealer brush as a gift for a family member with skin spots, citing better quality than cheap alternatives previously used.