Jung AhReum, Sophmore, transferred to Bighit High School in the middle of freshmen year. Became popular on the first day for beautiful looks and personality. 

Park Joohyuk and Park Bogum the manga like twins at Bighit High also known as Jung Ahreum's best friends after they befriended her on the first day of school. 

Kim Soojin Ahreum's long lost childhood friend from Busan, lost contact but its ok since they met again.

Last but not least, BTS the praised kingka group at Bighit High. Not only praised for their looks but also for their personalities, being some of the most popular kids in school they don't let their ego get to the best of them and ask modest and humble. 

But ONE day because of ONE survey ONE life had been changed.