K-SECRET SEOUL 1988 Glow Serum: Niacinamide 15% + Yuja (30ml) is a brightening and hydrating serum designed to revive dull, tired skin. With 15% Niacinamide and Yuja Extract, it reduces dark spots, evens skin tone, and enhances natural radiance. The lightweight, non-greasy texture absorbs quickly, leaving a smooth, glowing finish. Suitable for all skin types—especially dull or dry skin.