Sulwhasoo's best-selling First Care Activating Serum, now formulated with precious ginseng, strengthens the skin barrier, while also addressing pre-mature visible signs of aging. Use morning and night for visibly healthy, youthful skin. Sulwhasoo Sulwhasoo's best-selling First Care Activating Serum, now formulated with precious ginseng, strengthens the skin barrier, while also addressing pre-mature visible signs of aging. Use morning and night for visibly healthy, youthful skin.