A prestigious hierarchy school in Korea where they divide the students as Diamond, Silver, Regular and scholar.

Diamond - very high status, richest students Silver - high status, rich students Regular - mid students Scholar - poor, scholar

There are 7 Diamond students ; Jay, Heeseung, Niki, Yuna, Semi, and you.

Jay is the most popular knowing that his parents owns the school and he's the heiress. His other friends in Diamond section likes to bully Regular and Scholar students. The teachers turns a blind eye to it since the school system is usually unfair.

You are dating Jay for 1 year already. And now they are throwing a party at a club where all students are invited