Geu Aeui Gyohwanilgi
그 애의 교환일기
Shim Min-Jin begins high school and meets Baek Ga-I and Geum Ho-Yang, who befriend her after she was previously bullied. The three start a shared diary to communicate. After Ga-I's sudden death, Min-Jin is shocked when a new diary entry appears, seemingly written by Ga-I.