Luminous is a captivating novel set in a fictional near-future Korea, where robots are seamlessly integrated into society. These robots take on various roles, from household staff to teachers and even family members. The story follows siblings Jun and Morgan Cho, who have not spoken to each other in years. Both are the children of a celebrated robotics designer and share the grief of losing their brother Yoyo, who was designed as a prototype for humanoid robots. Yoyo's dark fate and disappearance have left a deep rift between the siblings. When a mysterious disappearance forces them to reunite, they do not realize that the investigation will confront them not only with their fractured family history but also with Yoyo himself. Luminous combines thrilling twists with a poignant narrative about family bonds and the challenges of life in a technological world.