Hierarchy

Jooshin High School is the most prestigious school in South Korea. The school was established by the conglomerate Jooshin Group. Normally, only students that are chosen at birth to attend Jooshin High School are allowed. Those students include Jung Jae-Yi (Roh Jeong-Eui), who is is the first daughter of the family that runs Jaeyool Group, Kim Ri-An (Kim Jae-Won) who is the successor of the Jooshin Group, Yoon He-Ra (Ji Hye-Won) who is the youngest daughter of trading company International Yoon, and Lee Woo-Jin (Lee Won-Jung) who is second son of a powerful politician family.Meanwhile, Kang Ha (Lee Chae-Min) is transferred to Jooshin High School. He possesses a pure and innocent smile, but he holds a secret. Due to him, the concrete world of Jooshin High School begins to crack.