Ranks or Hearts - Gyuricky

Seoul Academy is one of the top prestigious academies in Korea. Everyone is ranked by social class, and their only chance to rank higher is by passing the hierarchy test.

Or

Shen Ricky is everything one aspires to be. He has perfect grades, is handsome, and from a wealthy family. His cold demeanor makes him hard to approach, but his status buys him respect.

AND

Kim Gyuvin is the complete opposite of Ricky. He is cheerful, kind, and comes from a low-income family, which makes him an easy target for entitled jerks.

When their paths cross, their worlds change for better or for worse.

Some references of Hierarchy from Netflix.
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Also on AO3