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 every time but doesn't have enough money for his dream college.
