I absolutely adore the Missha Time Revolution line. I noticed significant difference after using it for 5 days! It is somewhat viscous, but a little goes a long way. I love the dropper and built in stopper that prevents excess product from sticking to the sides of the dropper and being wasted. Scent is light, no issues with sensitive skin. I recommend using this with a dermaroller for enhanced absorption and effect. Stock up when it goes on sale!