Most Popualr Korean Brand Smooth Liquid Eyeliner Pen Fast Dry 

3CE 3 CONCEPT EYES DARK BLACK SUPER SLIM WATERPROOF PEN EYE LINER

A slim and defined brush made easy to draw lines (thick & thin) for more deep looking eyes.
It is waterproof, long lasting and easy to apply.

Instructions:

Apply along the base of the lashes to fill in the gaps. Shake eyeliner with the cap on 2 or 3 times before use. When using for the first time or if the color is too light,​ leave it for a couple of minutes with the tip down after shaking. Let it bleed out on a tissue before applying to eyes.