Hyun Sook is a single mother raising two teenage daughters while working at a grocery store. One day, her youngest child, 14-year-old Cheon Ji, suddenly commits suicide without even leaving a note. This comes as a shock to Hyun Sook and her older daughter Man Ji since Cheon Ji was a sweet child, who rarely complained and studied hard, while always trying to comfort her hardworking mother. Struggling to understand why Cheon Ji chose to kill herself, the two women wonder whether there was something they didn’t know about Cheon Ji’s life. As Hyun Sook and Man Ji unravel Cheon Ji’s quiet life, they come to realize that she had been the victim of brutal bullying at her middle school, led by Hwa Yeon, a troubled, manipulative teenager.
