Series loyalty and line extension
Multiple reviewers explicitly state they purchased this product because they were already using other items in the YUNJAC Prep series and wanted to try the new sun serum variant. This indicates strong brand retention within the product line.
Makeup base/prep function
Consumers bought this specifically as a primer or makeup base solution, attracted by the dual function of sun protection combined with prep benefits to prevent makeup breakdown and improve adhesion.
Problem-solving for makeup durability
Some buyers purchased it specifically to address concerns about makeup melting or falling apart, particularly during summer or on busy mornings when they needed a quick, effective base layer.
Lightweight sun protection alternative
Reviewers sought a non-sticky, non-white-cast sunscreen option that felt more like a serum than traditional sunscreens, suggesting dissatisfaction with conventional sun products on the market.
Repurchase and recommendation within network
Several reviews mention satisfaction leading to purchases of complementary products in the series (e.g., cushion compact), indicating word-of-mouth and loyalty-driven repeat purchasing behavior.