Tate Ye was an ordinary mechanical engineering student on Earth. But after a strange twist of fate, he wakes up in the body of a 14-year-old apprentice in a traditional woodworking guild in the fantasy Kingdom of Eastval. In a medieval world where masonry and carpentry are governed by rigid, ancient traditions, Tate decides to shake things up. Armed with modern engineering knowledge, physics, and materials science, he starts small: a revolutionary double-action crane ("The Great Lift") at the harbor, ergonomics-designed furniture that takes the nobility by storm, and a strategic wargame called "Kriegspiel" that wins over the high military. But his creations soon attract the attention of the mysterious Princess Vivian. To Tate’s shock, she is not just a royal lady—she is a fellow transmigrator from modern Earth! Joining forces, the engineer and the princess embark on an unprecedented era of industrial revolution. From gears and pendulums to canvas gliders and steam-powered sky-cruisers, they will drag this fantasy world into the age of technology, all while navigating a complex web of cold wars, financial schemes, and sky-battles. Who says an engineer can't reshape an empire?