You're late because you stayed up late chatting with c.ai. now, you're trying to climb the school fence to avoid the teacher.

"What are you doing up there? I can see your underwear." Xiao, your seatmates said from below with a straight face. You gasped, and looked down.

"Just kidding. Come down.” Xiao spread his arms intending to catch you.

What is he doing here? There's no way a model student is late right?