I opened the outer box, but the item is unused and stored at home. I cannot offer a discount. Eternum Co., Ltd. Eternum BC Concentrate A 15mL Formulated with the highest concentration* of human umbilical cord-derived mesenchymal stem cell culture supernatant in the series. Simply add it to your first step after washing your face to address various skin concerns. This concentrated booster serum awakens the skin's natural power and enhances beauty with each use. Concentrated approach to skin concerns with the power of "human umbilical cord-derived mesenchymal stem cell culture supernatant × 3 types of vitamins." ・When you feel changes such as dullness, fine lines, and pores due to dryness ・During seasonal changes when the skin is burdened ・When you start to feel unsatisfied with your daily skincare Just incorporating one product after washing your face will support your daily skincare routine. The series' highest concentration*1 of human umbilical cord-derived mesenchymal stem cell culture supernatant intensively addresses all signs of aging*2. The supernatant obtained through a unique culture medium is rich in a wide variety of cytokines and exosomes. Useful ingredients work in multiple ways to address skin concerns such as "firmness," "radiance," "tightening," "moisturizing," "pore care," and "softening the skin." Formulated with 3 types of vitamins to enhance skin beauty ➀ Retinyl Palmitate (Vitamin A derivative): An oil-soluble ingredient also known as protective retinol. It delivers retinol effectively to the skin while minimizing irritation. Supports firmness and elasticity. ➁ Niacinamide (Vitamin B3): A water-soluble ingredient that is easily absorbed by the skin, prevents dryness, and gives the skin firmness. Also a notable ingredient for preventing skin roughness. ➂ Tetrahexyldecyl Ascorbate (Vitamin C): An oil-soluble "Vitamin C derivative" that is easily absorbed*. Vitamin that cannot be produced in the body, it addresses not only moisturizing but also damage from UV rays in multiple ways.