The Sun Never Sets In Spain, also known by its abbreviations TSNSIS and 西班牙日不落, is a historical novel that follows Crossing, the Spanish prince of the 19th century, as he revives the grandeur of the empire's early days. Set against the backdrop of a Europe and United States dominated by Spain, the novel explores themes of power, conquest, and ambition. With elements of appearance changes, army building, and strategic battles, this story delves into politics, military tactics, and the intricacies of royalty and nobility, offering readers a rich narrative woven with industrialization, modern knowledge, and hidden abilities.