COSRX Vitamin Serum, purchased with my own money

I bought this with my own money at Olive Young.

COSRX The Vitamin C 23 Serum is sold at Olive Young for 23,000 won. It is a high-intensity Vitamin C serum containing 23% pure Vitamin C that helps improve uneven skin tone and supports clear and healthy skin care.

I have been using this for two months due to concerns about my skin becoming dull and darkened during the summer, and I have definitely experienced improvement in my skin tone and texture, as well as a clearer complexion.