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
