A - Park Yura is 18 years of age, and is a daughter of a millionaire. Her mum ran away from the moment she was born and she has been left in the care of her dad. Yura is daring and bold, she likes to dance and sing. She is known as the Princess of the school, but only has one friend: Go Sera. Though behind her facade Yura is actually quite sensitive and is also known as the teacher's pet as she always ranks in the top 5 in her studies. 

A - Byun Baekhyun is 18 years of age, and is the son of a wealthy family, his family is one of South Korea's precious and most well known Law Firms. He is the typical cold and distant male, that is always compared to his cousin Mark. Though Baekhyun detests pretty much everything in his life, he enjoys singing and taking a break from everything that is happening. He is only nice to his younger brother, and his best friends EXO-K. He is also well known as the teacher's pest. 

A+ : Kids who are owners of multinational corporations and are well known worldwide, the best of the best. 

A : Those who are rich, famous and talented, higher ups. 

B+ : On the edge of success, they're reaching their as they are bursting with talent and fame. 

B : Well off than others, they're moderately rich and own a few establishments here and there. 

C+ : Average, those who have to try their best to survive in the world.

C : Seemingly poor, barely enough to pay for their tuition and are not so talented. 

D : Scholarship students, they are always being mocked and usually the outcasts of the school as they're poor. 

In a world of classes, just how far do you think you can go?