High School Mystery Club

In Hye And Ae Ri’s Friendship (1x11)

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The girls bring in a box filled with In Hye’s things and go through her belongings carefully. They find a pink diary that was a friendship diary In Hye and Ae Ri shared for years. While reading thoroughly, they realize a pattern and a code chart incorporating emoticons and punctuation marks. What really happened between In Hye and Ae Ri?