1+1 promotional value
Many reviewers explicitly cite the 1+1 (buy one get one) set as the reason for purchase, calling it a great deal and good value for money.
Repeat/repurchase loyalty
A large number of reviews are from customers on their 2nd, 3rd, 4th, or even many-times repurchase, saying they always come back to this eyeliner after trying others.
Reputation for long-lasting, waterproof wear
Reviewers say they purchased after hearing or reading it doesn't smudge or fade compared to other brands like CLIO, driving trial and switching.
Thin/precise tip for detailed use
Buyers seeking a very fine pencil for waterline, tightlining, or under-eye lines chose this product for its slim tip versus bulkier competitors.
Affordable price point
Several reviews mention buying because it is cheap or budget-friendly relative to other Korean eyeliner brands.