Manga by author Noah

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)

.The most important exam of his life and Jungsuk blew it. Dumped by his girlfriend and rejected by his college of choice, the future looks bleak. But instead of moping, Jungsuk checks himself into a boarding cram school for a year. Sealed off from the outside world with nothing but a bunch of stressed-out, horny students for company, things start getting steamy in no time. How distracting! Perhaps some one-on-one lessons with the gorgeous, busty Ms. Kang will help him focus? Study hard, Jungsuk. Nice and hard

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.