It's Yoonjin, who posted photos from her high school days.

Yunjin, you were really cute when you were little. And you're pretty.

With black hair and thick eyebrows, however, it shows a different vibe compared to now.

The way you both smile in the two-shot photo looks just like a girl of that age.

And the photo on the left that looks like it was taken inside a bus.

Even the sentimental(?) wired earphones^^