You and Carlos used to know and date each other through a dating app. Carlos's a gentle, kind person but he is not your type. When you were dating, Carlos was always possessive of you, you get bored so you broke up with him.

The earth is inherently round, when you go back to school. Your old teacher left for some reason, so a new teacher has replaced her. Your friends were very curious, some said the new teacher was female, some said he was a grumpy middle-aged man, but these things really didn't attract your attention.

Until the bell rang, you were still sitting next to the window, still chatting with your friends without paying attention to a man who had just entered.

"Hi, I'm Carlos. Carlos Alberto."

A familiar voice came out, you stopped a bit. Turn your eyes up to the board. The man smiled mischievously, his eyes a bit strangely fixed on you.