Great Tang: The Three-and-a-Half-Year-Old SizI and My Dual-Transmigration System

What should you do after being reborn as the Tang Dynasty's shortest-lived princess?

Li Mingda says: Set a modest goal first: live past the age of twelve, and while I'm at it, turn the Tang Dynasty into an empire on which the sun never sets.

At three and a half, she shows up at court with a pacifier in her mouth and reveals potatoes that yield fifty dan per mu. The Minister of Revenue drops to his knees on the spot. Then she builds a wind turbine beside Taiye Lake, makes her Crown Prince brother memorize the periodic table, and inspires Cheng Yaojin's grandson to make explosives at home. He blows up seven alchemy furnaces in a month.

Li Shimin: Sizhi, when did you learn to make that stuff?

Sizhi: I dreamed it! Didn't Father say I was an auspicious blessing?

Even more outrageous, she can travel back to the modern world, use a family heirloom from the Zhenguan era to raid Christie's auction house, then bring solar panels and the Great Tang Medical Compendium back to the Tang Dynasty.

The officials: Your Majesty, please do something about the princess!

Li Shimin: Whatever my Sizhi does is right!

Three timelines, all competing like mad, using the cutest faces to build the most ruthless careers.

(This is a lighthearted fictionalized historical tale and has no connection to actual history.)