A Wise Ruler's Self-Cultivation [Quick Transmigration]

Xie Huazhang is a history whiz about to graduate from university. Just as he is about to inherit the family business and become a carefree landlord, he transmigrates, landing in the infamous "Great Wuss" dynasty. As the third son, Zhao Kai is born noble and gifted, but none of that matters. It's all useless! His father is Emperor Huizong of Song, Zhao Ji; his elder brother is Emperor Qinzong of Song, Zhao Huan; and his younger brother is Emperor Gaozong of Song, Zhao Gou. The first two useless teammates conspired to bring about the "Jingkang Humiliation," an event even textbooks would rather not dwell on. The third useless teammate is a notorious emperor who fled for his life, forever dragging everyone down. He even killed Yue Fei, the loyal patriot, on the groundless charge of "fabricated crimes"! Having studied history and knowing that "he" is destined to die young, Xie Huazhang says: I'm tired. Just destroy the world :) After finally turning the "Great Wuss" dynasty into a powerful empire, Xie Huazhang dies peacefully of old age. He thinks he can return to the modern era, but little does he know that the Spring and Autumn period, the Warring States period, the Five Dynasties and Ten Kingdoms, and many more dynasties are waiting for him. And every time, he starts with a truly terrible hand. Besides the Jingkang Humiliation, there's the An Lushan Rebellion, the Upheaval of the Five Barbarians, the Tumu Crisis, the Ten Days of Yangzhou, and more waiting for him... Xie Huazhang, who has studied history and knows all the creative ways "he" is going to die: I'm really tired. Just destroy everything! I've already been angered to death!! #Of course, he can't actually die. All he can do is beat his enemies until they're wailing and begging on their knees, wishing they could take back what their ancestors did for eighteen generations.# P.S.: 1. A series of spin-off stories set in different dynasties. The focus is on his career, with no romance or very little romance. 2. The protagonist isn't perfect. He grows toward the standard of a competent emperor, with no romance. 3. The Song dynasty world's extra chapters feature characters from Water Margin, so proceed with caution if that bothers you. The protagonist has a [Toxic Romance System]. A romance-brained System that loves melodramatic romance novels goes up against a workaholic protagonist whose mind is full of nothing but his career! Theme: A strong ruler makes a strong empire.