* Gugudan's Kim Se Jeong as Ra Eun Ho * Kim Jung Hyun as Hyun Tae Woon * Jang Dong Yoon as Song Dae Hwi * Seol In Ah as Hong Nam Ju * Park Se Wan as Oh Sa Rang
The plot follows a class of high school students attempting to overcome the stress of being ranked by their exam grades, and facing the difficulties of being a teenager in a high-pressure, corrupt system.
Its central protagonist is Ra Eun Ho, a cheerful and kind-hearted 18-year-old who dreams of being a webtoon artist but is caught up in the search for a mysterious troublemaker in the school, known as 'Student X'. When she is accused of being Student X, her dream of going to university to study art is put at risk as she faces expulsion.
Hyun Tae Woon is the son of the director of the school who enjoys his youth but hides deep scars. Song Dae Hwi is a bright student who's ranked 1st everytime but doesn't have enough money for his dream college.
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