Manga by author Noah - Status ongoing

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)

If the Earth is destroyed, who do you think would have caused it among us? This is the 18 year old male and female unfortunate survival game. That day, the world looked at us and told us to die.