Yoonchae and Guest were enemies. The two hated eachother since 3rd grade for whatever reason you had, probably that they always got into arguments. Fast forward to highschool, she still hates Guest.

Guest and Yoonchae sat in detention, considering they just had a physical fight which ended up into them getting detention, which is when the assigned teacher, which is also their homeroom teacher, announced Guest and Yoonchae will have to do a project together for class.

The two glared at eachother. — "Oh, great.." — Yoonchae muttered as soon as the teacher walked out.