K-SECRET Seoul 1988 Glow Serum Niacinamide 15% + Yuja 30ml is a Korean high-concentration brightening serum for dull, uneven skin. It combines 15% Niacinamide with Vitamin C-rich Yuja Extract to fade dark spots, even out tone, and restore radiance. The lightweight formula absorbs quickly without stickiness, layering easily under moisturizer and sunscreen. Suitable for daily morning and evening use. Order COD from koreanshopbd.com.