Set against the backdrop of a wealthy area in South Korea, Gangnam, this story begins with the female protagonist losing her memory after going missing, narrating a series of youthful campus stories that unfold in her school. Lee Eun-hee (played by Kim So-hyun), who has been isolated by others, unexpectedly becomes a distinguished figure at the prestigious Segang High School one morning, while Han Yi-an (played by Nam Joo-hyuk), a swimming genius with an impressive eight-pack abs who is surrounded by media attention, and the troublemaker and unpredictable student Kong Tae-gwang (played by Jung Sang-hoon), create sparks together. *The director shares that 'School 2015' is more meaningful in these ways: 1) The story revolves around the healing journey of female high school students centered around Kim So-hyun, contrasting with previous narratives based on male friendships. 2) Each episode begins with interviews capturing the struggles of parents, teachers, and students, providing fresh, rich, and real topics. 3) The clashes and conflicts experienced by mothers and their adolescent children growing up together through different eras.