The story takes place in the fictional Chinese kingdom of Caiyun. According to legend, a young man, aided by the power of the Eight Immortals, founded Caiyun. Consequently, Caiyun's territory was divided into eight provinces: Hongzhou, Huangzhou, Bizhou, Lanzhou, Zizhou, Heizhou, Baizhou, and Chazhou. Approximately 600 years ago, the king of the time ordered the nobles of each province to adopt one of these eight colors as their surnames (for example, the Marquis of Lanzhou became Lan, the Marquis of Hongzhou became Hong, and so on). Commoners were prohibited from sharing surnames with these eight marquises. Consequently, those bearing these eight colors were considered the most aristocratic of the nobles. Furthermore, because the Marquis of Zizhou, where the capital was located, also served as king, the Zi family became the royal family's surname. Despite being born into the prestigious Hong family, Hong Xiuli lived in poverty. She had to work extensively to support her family. Having experienced the turmoil of the throne struggle as a child, she deeply understood the suffering of the people. From a young age, she diligently studied, hoping to pass the imperial examination, become an official, assist the king, and build a prosperous and peaceful nation. However, as a woman, she cannot take the imperial examination. One day, Xiu Li accepts a high-paying commission from Grand Tutor Xiao and enters the harem as a noble concubine to teach and assist the incompetent emperor. This opportunity leads Xiu Li to a career as an official, and she encounters a variety of people.

In a rigidly class-based interstellar empire, Lin Xingchen, a girl from a garbage planet, steals medicine from nobles to save her adoptive mother, only to become embroiled in a deadly conspiracy. On the verge of death, the dormant ancient AI "Silver Moon" in her right eye suddenly awakens, granting her dual stellar power and mechanical talent. Seeking revenge, she assembles the mecha "Rusty Moon" from scrap metal, turning the tide in a deathmatch against the noble team, but also revealing her identity as a "clone of an ancient civilization."

Forced into the Federal Military Academy, Lin Xingchen finds herself navigating relationships with the cold-faced instructor Gu Chenxing, the androgynous prince Chu Xinghe, and the Zerg warrior Ling Ye. While establishing the "Starry Sky Merchant Guild" to monopolize the female mecha market, she also unravels the dark experiments of the "Rose Project." When the Zerg Queen resonates with her, and Yin Yue's memories gradually return, she discovers that the entire interstellar war is a cruel experiment by an advanced civilization…

This book is composed of three works by Jiutu: Sui Chaos, Founding of the Nation, and Smoke and Clouds of the Prosperous Tang Dynasty, which are set in the Sui and Tang Dynasties.

Main characters: Li Xu, Li Wan'er,

Lute, a boy reincarnated into a magical otherworld, will use modern weapons to create a legend!

Lute—a boy who died after being caught up in a case, only to wake up to find himself reborn in a magical world.

In a world where magical talent can dictate one's life, his magical power is pitifully small.

So he used modern knowledge to create "guns"—he was a "military geek" who loved military equipment during his "life"!

Harboring the unfulfilled desire to save others from his past life, Ryuto works hard to create weapons to protect his childhood friend, the dog-eared girl Shirayuki, from the approaching monsters!

This is the story of a boy who eventually creates his own army (harem) and uses that power to save people—a story that may soon become a legend!