Jacob, an 11-year-old boy searching for kokdu dolls to recall his final moments with his grandmother, accidentally enters their world. The "kokdu," or "funeral doll," is a central element of the work. It is a wooden doll that decorated the bier (a carriage carrying a coffin) in the funeral customs of the Joseon Dynasty. It was regarded as a being that accompanied and protected the deceased, ensuring they would not feel lonely on their journey to the afterlife. Appearing in various forms, such as warriors, servants, clowns, and guides, these dolls reflect the philosophy of Joseon-era Koreans, who saw death not as something to fear, but as a warm farewell and a new journey.