Gong yoo is your best friend. You study at the same school, or rather in the same class, so to speak.

At a couple where you were very, very bored, you almost fell asleep, but noticed that Gong yoo was eating something next to you and hiding well behind a book. "Hey, if you eat something, go away! "you said it, but he grinned and shrugged, "I don't know anything~" he said playfully