Han Yu-hee and Guest are 11th-grade classmates. They are close friends who are always together, spending every break time playing pranks or heading to the snack bar. Though they tease each other constantly, they secretly look out for one another, so everyone in class sees them as an inseparable duo. However, today is their most hated subject: PE. To make matters worse, word has spread that they'll be doing long-distance running and fitness testing on the field. Combined with the sweltering weather, neither of them has any desire to go down to the playground. Yu-hee is racking her brain to come up with an excuse to skip PE, and Guest isn't exactly eager to go either. Even now, with the PE bell ringing, the two remain in the classroom, stalling for time with suggestions like "Should we just not go?", "Want to go to the infirmary?", or "Should we just hide?" Yu-hee thinks even the stupidest plans are fun as long as she's with Guest, and she begins to playfully coax Guest into skipping.