On 29th, KBS 2TV ‘School 2017’ shows the school director Hyun Kang Woo who knows the true identity of X is Hyun Tae Woon (Kim Jung Hyun).
Oh Sa Rang feels angry at Ra Eun Ho (Kim Se Jung) who keeps X’s identity and her relationship with Hyun Tae Woon. Plus, if Hyun Tae Woon does not admit that he is X, the principal threatens to fire his mother who works as a cleaner at school. Oh Sa Rang always looks moody when Ra Eun Ho defends Hyun Tae Woon. Finally, Oh Sa Rang gives a box to the headmaster.
Ra Eun Ho who saw the behavior of Oh Sa Rang pulled her and asked how she could do that. Both of them pour each other’s emotions and finally cry. Ra Eun Ho first conveys her heart, Sa Rang also explains the situation she had. Both apologise to each other. After reconciliation, the two plan a revenge on the principal that causes this to happen.
First of all, Oh Sa Rang entices the principal to meet X somewhere. Oh Sa Rang also told him to go to the place alone. The headmaster waits for X but what appears is Ra Eun Ho, and Ra Eun Ho discusses her food poisoning. After that Ra Eun Ho leaves. Sa Rang’s mother came after cleaning the school garbage can and exposed the expired food packet. The principal laughed and said there was no evidence that said it came from the canteen. Oh Sa Rang’s mother shows a video as evidence.
Inside the video, X is robbing the school food storage room and taking out the expired food in the closet. The school principal panics, Hyun Tae Woon deliberately brought his father who is the director Hyun Kang Woo to see the incident. Hyun Kang Woo looks angry at the principal. That way, Ra Eun Ho and Oh Sa Rang’s revenge went well.
But there are still some problems left. Hyun Kang Woo knows X’s real identity is Hyun Tae Woon. Hyun Kang Woo is angry with Hyun Tae Woon and says he’ll get Ra Eun Ho out of school.