Yellow Robe? I've Been Suffering Enough

Zhao Fengnian transmigrates into a fictional world as a Prince of the Great Yong Dynasty. After the previous owner offended the Crown Prince three years ago, Zhao is trapped in the princely mansion in Youzhou City, facing starvation. Suddenly, he awakens the Heavenly Mandate Summoning System. Using the system and his modern knowledge, Zhao avoids danger, resolves crises, and takes control of Youzhou. Building his base there, he recruits troops, grows his power, clears the court faction, marches on the imperial palace, and engages in a final battle with the Crown Prince's forces. Ultimately, Zhao ascends the throne.