From the Start, Exiled a Thousand Miles with Seven Sisters-in-Law

He transmigrates into the son of the Great Qian Dynasty's most notorious traitor. From the start, his father falls from power, every male in the family is executed, and he is left as the sole surviving heir, sentenced to exile in Lingnan alongside his seven beautiful sisters-in-law. The guards are sharpening their blades, the journey is fraught with danger, and his sisters-in-law weep in despair. Su Ming awakens the Prison Break Sign-In System and, from the start, claims three thousand Snow Dragon Cavalry! A guard tries to bully his eldest sister-in-law? Kill him! Bandits try to abduct his third sister-in-law? Wipe them out! At the place of exile, while others scrape by on gruel and wild greens, Su Ming leads his sisters-in-law in building a city, developing infrastructure, and enjoying hot pot. The emperor: I exiled Su Ming because I wanted him dead. How did he turn Lingnan into an independent kingdom?