C1860 Goodbye High School

Lee Yun offered a slight smile. "I've got a get-together with classmates later, so I figured I'd just stay in the classroom and enjoy the air conditioning. It's way too hot outside."

"Hahaha, absolutely!"

The group burst into laughter. The reason was both surprising and perfectly understandable. But soon, their laughter faded.

They had all been diligently working in the classroom