Kim Sejeong became a loner because of X and best friends Kim Jung-hyun and Jang Dong-yoon built more hatred for each other.
On the latest episode of the KBS 2TV drama "School 2017", Ra Eun-ho (Kim Sejeong) went after the culprit X.
Hero X's copycat crime was increasing. The principal Yang Do-jin (Kim Eung-soo) accused Ra Eun-ho of being an accomplice to X and suggested getting rid of her penalties if she found out who the culprit was. She needed a good student record to go to Hanguk University and agreed. Ra Eun-ho found a note saying, 'Hyeon Tae-woon (Kim Jung-hyun) and Song Dae-hwi (Jang Dong-yoon) weren't at the hall just now' and started becoming suspicious of them.