Yeon-ui Pyeonji

Lee Sori, a kind and principled girl, attends a middle school where bullying is rampant. After witnessing the devastating effects of bullying on her friend Kim Julie, she decides to stand up against it. However, this only leads the bullies to target her instead. Hoping a change of environment will help, Sori moves back to her former city and transfers schools. But the traumatic experiences continue to haunt her, causing her to withdraw from others. One day, she finds a mysterious letter under her desk, leading her on a scavenger hunt to uncover the purpose behind the letters and the person behind them.