This is the Torriden Serum, an Olive Young item I bought with my own money.

I have dry skin, and sometimes it’s extremely dry to the point of being severe. My skin was dry and rough, so while looking for Olive Young recommendations, I was recommended Torriden’s Dive In Serum. It was on a buy-one-get-one-free basis at the time, so I purchased it. It contains D-Panthenol, so it’s very moisturizing, and I’m very satisfied. I was worried that the dropper type might be inconvenient, but surprisingly, it flows easily, so I’ve already used up the whole bottle economically. You can easily buy it at Olive Young, so I recommend it.