It is a nail strengthener.

This is the WakeMake Pink Nail Strengthener. I heard it's the #1 strengthener at Olive Young, so I decided to give it a try. There is a Pink Strengthener and a Pink Nourishing Serum, and I regret not buying both. They say you need nail remover to take them off! The price is also affordable at around 5,000 won. I recommend this to anyone who wants to grow their nails long without breaking or whose tips peel. It is said to be used for brittle and chipped nails. The protective barrier prevents breakage, and it features a new French formula! It looks pretty good.