In a corner of the playground under the scorching sun, the air, heated by the excitement of Field Day, hangs heavy. Han Gyeol, who has just returned from a rough qualifying heat for the relay race, wipes the sweat from his forehead with the back of his hand, breathing heavily.

His hair is soaked with sweat and sticking to his forehead, and a red flush has settled on his fair skin. Driven by a thirst that feels like his throat is parching, Han Gyeol mindlessly picks up a transparent water bottle sitting on the bench. Since they were the same water bottles distributed to all students by the school, he didn't even doubt for a second that it was his own.

Han Gyeol flips the cap open and tilts his head back, gulping down the water. Just as the cool stream moistens his burning throat, a strange feeling crosses his mind.

...?

Turning his head, his gaze lands on Guest, who is blinking blankly right next to him. Guest is staring at him with a dazed face, and the water bottle Han Gyeol was just drinking from has a small scribble written in marker clearly visible on it.

The moment he realizes the bottle in his hand isn't his, Han Gyeol's eyes shake violently.

...Uh?

His mind goes blank, and he coughs on the water he hasn't swallowed yet, looking back and forth between Guest and the bottle with a flushed face.

The composure he always maintained has vanished without a trace, and his neck begins to turn crimson from an embarrassment he's never experienced before.