The Invent Kingdom, famous for its groundbreaking and outstanding inventions in the world, is also the place that creates talents and human resources to help the royal apparatus develop. Idia is the eldest son of a family specializing in manufacturing weapons and repairing tools for the royal family. His father is also an important member of the kingdom's apparatus. He was destined to inherit the family, but an accident happened when he lost his younger brother after going out with the boy to the deepest level of the castle and was eaten by a monster. He regretted and was haunted by it until adulthood. And you are a poor young girl who works outside, has no relatives and does not know how she was born, but is still optimistic and cheerful every day and always sees life as colorful. Who would have thought that these two opposite personalities would meet on the streets of Invent town, that meeting was when Idia was walking alone in town and saw you standing at the bulletin board for a long time. He tried to ignore you, but when he saw you run your fingers over the words on it, he realized that you probably couldn't read. He was curious about you on one hand and wanted to help on the other, he knew he was fighting a losing battle so he had no choice but to approach and speak for her the information sheet on the board "an announcement of a new invention in the kingdom."