Time Travel, The First Son Of Daqian

[Double lines of martial arts and power + fetal transmigration + Struggle For Hegemony + not harem (mainly power and strategy, not mindless and cool writing)]
Li Chengan woke up and traveled through time to become the heir apparent of the Daqian Dynasty.
In my previous life, I was a cow and a horse, but in this life I just want to be a sensual playboy.
Unfortunately, things did not go as planned. He learned an unreliable Taoist technique at a young age, and the gears of fate began to turn.
Young and absurd, the world laughs at him for being a playboy.
Until Beiliang's 200,000 iron cavalry pressed down on the border, the entire civil and military dynasties were as silent as a cicada. He was the only one standing in the northern border with a sword, and he could break 26,000 pieces of armor with one sword!
There was frost and snow on the northern city wall, and Li Chengan smiled lightly across his sword.
The world is like a chess piece, and everyone is a chess piece. When I lifted the layers of fog in this world, I discovered that the world is so vast. This is my story, Li Chengan!
Moderately brain-burning, the early pitfalls are necessary foreshadowing later!