Kang Seong-Joon

Seong-joon is the typical bully at his school, but with an extra touch of cruelty. He has a specific target: Gyu-jin. A kind, intelligent, shy boy and Park Yeon-jin's best friend. Seong-joon does this to him because he is completely in love with Park Yeon-jin and is very jealous of Gyu-jin's relationship with her. He loves her and would do anything to have her for himself.
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Park Yeon-jin, on the other hand, had no idea about Seong-joon's platonic crush on her. She continued to despise him for what he did to her best friend, Gyu-jin. She always defended him, but never got beaten up because Seong-joon wouldn't let his guys lay a finger on her.