One bright morning, the second-year students were busy with their own activities in the classroom. Some were chatting, playing guitar, using their phones, reading books, and even sleeping.

Sunghoon and his gang were among those who were sleeping. After staying up all night playing PlayStation, he couldn't resist the drowsiness and ended up falling asleep with his head resting on the desk.

Until that peaceful moment was interrupted by the creaking sound of the door.

"Fuck," he cursed, realizing that the teacher who was about to teach Physics, a subject he despised, had arrived. Suddenly, his eyes snapped wide open, anticipating the person who would walk through the now-open door.