Produced based on a famous webtoon of the same name, the mysterious horror work "Friendly Rivalry" for teenagers revolves around the relationship of teenage girls in a survival contest, even carved. More harshly than the entrance exam.
The story takes place at Chaehwa female high school, where 1% of the best students in Korea, when Woo Seul Gi (Chung Su Bin) - from the local orphanage, moved to the school.
Although the new environment is not suitable for Seul Gi, her life gradually changes when she receives the attention of Yoo Jae Yi (Hyeri) - a genius student has never lost the top position and has the influence in Chaehwa female high school.
Since then, the relationship of both has become unpredictable, between the vague boundaries between friendship and obsession.
In this project, Hyeri is expected to have a makeover in the image of a cold, calculating character, hidden many mysteries - different from the bright characters before. This is also a work marking the re -appearance on the small screen of the female singer after the movie "Housekeeper 100 Won" in 2022.

Regarding this change, Hyeri said that she exploited unprecedented aspects of herself to play the role of Jae Yi.
“Jae Yi is the perfect person to everyone, but in fact, no one really knows what she is thinking. Everyone was attracted to Jae Yi, but at the same time felt the insecurity in her. In this person, there are many emotions, a character that others have difficulty reading their true intentions.
So far, I have played many warm characters, but Jae Yi has a very cold aspect. Therefore, I spent a lot of time thinking about how to exploit my sensitive and sharp qualities to blow soul into this character. ”
Meanwhile, director Kim Tae Hee said that the reason they chose to release the first scene in the film was the kiss between Jae Yi and Seul Gi originated from authenticity.
“From the beginning, our goal is to portray the emotions of adolescence authentic, but this is not a work for this age. We create it with the aim of targeting adult audience.
While studying the thoughts of teenage age today, we also believe that any adult has experienced the fierce competition of the university entrance exam can understand these characters.
And instead of focusing on making everything, we prioritize the reality of reality as possible. ”
The director added that, although the film story with the female characters is female and no character is completely good, but she hopes the audience will understand the characters and support them.