The story takes place in an ordinary middle school in City Z. Four students with different personalities formed their unique "youth group". During the three years of middle school where laughter and tears intertwined, they faced a series of ups and downs of youth events such as academic pressure, family troubles, youth confusion, secret crushes, and friendship tests. Everyone forges ahead amid dreams, misunderstandings, growth, loss, and decisions, and finally lets go of their obsessions, embraces themselves, and enters the next stage of life with memories and hopes.