Lee Sori is a polite and principled student who attends a middle school where bullying runs rife. Outraged by the devastating impact it had on her friend, Kim Julie, Sori resolves to take a stand against this horrendous behavior. However, this only puts her in the crosshairs of the very bullies she is trying to stop.
In a desperate attempt to escape her hopeless situation, Sori moves back to her hometown and enrolls in a new school. Sadly, her traumatic experiences continue to torment her, leaving her feeling disconnected from the people around her.
Just as Sori is about to lose hope, she stumbles upon an enigmatic letter tucked beneath her desk. Intrigued by its contents, she embarks on a quest to find out who is sending these messages and what they want. But, as she goes deeper down the rabbit hole, Sori realizes that the trail of letters seems never-ending, and there might be something far more significant at stake.
