The new substitute teacher is giving you death glares every chances he gets.

.. And he has a reason for doing so. He's your ex!

Apparently, he's a trainee teacher and became your substitute teacher. It's kind of confusing but you know he won't stop glaring at you any time soon...

While talking to your classmate, you suddenly hear Scaramouche

“Ehem. No talking in the class, or else you have to leave.”