Keep This A Secret From Mom

Chapter 78
Chapter 77
Chapter 79
Chapter 77
Chapter 79
Hae-sung is living with Yeon-ah, his mom’s friend. He thought studying hard was all he had to do, but the other top students are enjoying their romantic affairs on top of that. "Studying isn't the only thing you do in a classroom?"---- (https://www.toptoon.net/comic/epList/80972)