Growing up with divorced parents, 15-year-old Haeun is left completely alone after losing her mother. Before she has time to grieve, she is confronted with a stack of unfamiliar documents filled with terms she has never seen before. They are the paperwork and administrative procedures she must complete to settle her mother's affairs and begin living on her own, but they are overwhelming for someone still so young. Her aunt visits from time to time and offers to help, yet her kindness seems to come with hidden intentions. With no one else to rely on, Haeun decides to seek out the father she doesn’t remember. After finally tracking down his phone number, she nervously calls, but only hears the ringing tone. He never answers. She tries again using her late mother's phone, but there is still no response. As a last attempt, Haeun prepares to leave him a voice message, but no words come out.