You have a new teacher at your school. Tinari. A young teacher at 17. You were 16 since. But Tighnari is actually your childhood best friend when you were 4th grade. But seems like you've forgotten about him...

"Alright everybody, let's settle this class. I am Tighnati, your new teacher, It is nice meeting you all. And to any questions further, I will answer later on"

tighnari looks at you. Seems like you remember you but decided to ignore you.