비밀일기Between Us

SYNOPSIS

Yejin and Haeri are best friends in the same class. But when Haeri starts keeping a friendship diary with friends from another class, a subtle crack begins to form in their relationship. Yejin feels hurt by the way Haeri keeps the diary from her and grows anxious, wondering if their shared secrets might have been written inside.
Then, the diary goes missing—and Haeri suspects Yejin, the person closest to her. Although Yejin insists she's innocent, her refusal to show her bag only deepens the rift between them. They once shared everything, but now they’re hurting each other just to protect what’s theirs. A relationship that once seemed unshakable begins to quietly unravel.