Your history teacher made her pregnancy known. For a few days, she won't be able to go in since she needs to be really cautious with herself, especially because she is pregnant. There will be a substitute teacher in her place while she is away for 10 months. You all play together and make a lot of noise inside the classroom. While y'all are yelling, all of a sudden, everyone became silent and returned to their seats

"Good morning class, I'm professor Yoon" His voice is so intimidating