System + transmigration + technology + family + war
The day I transmigrated into the body of Zhu Xiongying, the Ming dynasty's eldest legitimate grandson, my mother died in a difficult childbirth, and my father, Zhu Biao, wept himself unconscious in the history books.
The System told me: Want to save your family? Pay with your life!
So, at five years old, I grabbed Zhu Yuanzhang's beard with one hand and held up a flintlock rifle blueprint with the other.
"Old man! Want to use this thing to blast the Northern Yuan and trade for my mother's life?"
Zhu Yuanzhang looked at hybrid rice yielding a thousand jin per mu, then touched the model steam engine. That very night, he kicked open the Eastern Palace gates.
"Biao'er! You can forget about being Crown Prince. My grandson is the only one fit to sit on the throne!"
I slapped The Exploitation of the Works of Nature in his face.
"What's the rush? The treasure ships haven't sailed west yet, and we haven't finished digging up the Japanese pirates' silver!
When the iron cavalry of the Ming tramples the grasslands, and the Divine Engine Battalion's cannons light up the night sky over the Japanese islands,
Lan Yu will raise a bloodstained battle flag and roar:
"Crown Prince! Your unsetting empire is yours for the taking. Your uncles have conquered it!"
The court historian will tremble as he revises the Veritable Records of the Hongwu Emperor:
[That year, the five-year-old imperial grandson pointed at the globe and declared: Wherever the sun and moon shine, it is Ming territory!]