Double Crossing to the Tang Dynasty: Brother, Open the Door, It's Sizhi!

[Princess Jinyang Li Mingda's daily life + dual transmigration + no System + adorable child + everyone's favorite + Princess Changle] Princess Jinyang Li Mingda transmigrates into the home of He Zhou, a struggling modern web novelist, and a doorway through time and space opens! He Zhou travels back and forth between the Tang Dynasty and the modern era. He witnesses the historically short-lived Princess Changle and sees the peerless empress of the ages for himself. From then on, the Tang Dynasty gains high-yield crop seeds such as potatoes, corn, and sweet potatoes! Heat patches, hot-water bottles, thermal underwear, and down jackets become the Tang Dynasty's winter essentials! Little Princess: Brother, hurry and open the door! It's me, Sizhi! Li Shimin: Young Master He, give me a few more weapons, and I guarantee I'll wipe out every Japanese pirate.