Sample-to-full-size conversion
Many buyers say they received a sample (often in an Olive Young beauty box) and were impressed enough to purchase the full 30-pack.
Travel-friendly single-use format
The individually packaged sachets are frequently cited as the primary reason for purchase, since they're easy to pack for trips without carrying bulky jars.
Value for money
Reviewers repeatedly note that each sachet can be split into 2-4 applications, making the 30-count box feel like exceptional value relative to price.
Repurchase/brand loyalty
A notable number of reviews describe this as a repeat order or restock, and some mention using other JAYJUN sheet masks and trusting the brand.
Gifting
Several buyers purchased boxes specifically to give away individual sachets to friends, family, or coworkers as easy K-beauty gifts.