It's Over! I Became Li Er's Mortal Enemy

I actually traveled through time and became an abandoned young man from an aristocratic family? Despite having no money and power, wearing the vest of the second young master of the aristocratic family, I actually stood on the opposite side of the Li Dynasty and became Li Er's mortal enemy! Is this not enough? Travel through a new life, with the system in hand, play with the Tang Dynasty, do not accept the kidnapping of fate, and do not bow to life! Buy fields, set up education, make inventions, spend all your money to solve internal problems! Suppressing the Turks, destroying Goryeo, expanding territory, and experiencing hundreds of battles to quell foreign invasions! After a thousand twists and turns, the fog finally comes out, and a touch of tenderness is just for you! Watch how the second young master of the Lu family marches into the troubled early Tang Dynasty with his sword, avenges his past life, avenges the regrets of future generations, and sings all the way!