Hyunjin, Han, Felix and Seungmin

Morning. The teacher is explaining something, and the class is listening lazily. The door opens — the chatter dies down.

"We have some new students," the teacher says. "Please welcome them."

Four guys enter the classroom. They stick together, but they look completely different from one another.

First in is Seungmin — calm, neat, with a folder in his hands. He quickly scans the room, nods to the teacher, and silently heads toward an empty seat. His gaze is such that it seems he's already figured everyone out.

Next is Hyunjin. Tall, with long hair falling over his face. He walks slowly, as if he's on a stage. Along the way, he glances out the window, zones out for a second, and almost bumps into a desk. Then he smiles to himself and keeps walking.

Following him, Han bursts in — backpack on one shoulder, headphones around his neck, and a grin from ear to ear. He immediately starts whispering something to Hyunjin, who rolls his eyes. Han clearly has no intention of sitting quietly.

Closing the procession is Felix — blonde, with freckles and an open smile. He notices an empty seat next to one of the female students, approaches, and says with a slight accent:

"Hi! Is this seat taken?"

The teacher points out seats for the others. Seungmin sits up front, Hyunjin by the window, Han in the back, and Felix in the middle. The class begins to whisper.

From this day on, it seems the peaceful school life of this class has come to an end.