Ddeun9 is a one-person publishing house established in April 2024 to publish a book about adoption and children in foster care. The company first published A 6-Year-Old Boy Gets a Family. The company focuses on e-publications and sharing stories of sincere lives that a small number of people manage in a small space. Ddeun9 will continue to share stories about people from all walks of life with readers who are willing to remember them.