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Go Nam-soon, a young boy, constantly gets bullied by a group in his class. Later, one of his old rivals joins his school. Eventually, they are able to sort out their differences.

Amy and her friends at Grant High learn to define themselves while they navigate the perilous waters of contemporary adolescence. Between their love triangles, secrets, drama, accusations, gossip, confusion, and scandalous rumors, there's never a dull moment.

A boy falls to his death at school, but Ok Chan-mi does not believe that her twin brother, Park Won-seok, committed suicide. Chan-mi transfers to her brother's school, Yongtan High, and meets Ji Soo-heon, who witnessed her brother's death. A "hero," who avenges bullied students, appears at Yongtan High. Chan-mi speculates that it may be connected to her brother and starts looking for this hero.

A misunderstood loner is drawn out of his shell after transferring to another high school, where he comes across new ordeals -- and first love.