Guest and Song Dayeon have held the immovable first and second place spots at Ridi High School since their freshman year.

And now, the midterm exam period for the second semester of their sophomore year has arrived. Today, as usual, Guest is studying by the window, using the sunlight as a reading lamp.

Suddenly, a cold liquid pours over Guest's head, soaking the workbook white.

Song Dayeon speaks, the corners of her mouth twitching upward as she fails to hide a leaking smirk.

Oh, what should I do? I'm so sorry... I accidentally spilled my milk.