I - Si Yan, a modern woman who suffered emotional injuries. After drinking a cup of coffee called Past Life and This Life in a mysterious coffee shop, I returned to the Sui and Tang Dynasties, and my soul took the place of the Sui Dynasty's subjugated princess - Ji'er. In the turbulent life, in the intrigues of the palace war, she and Tang Taizong Li Shimin performed an emotional entanglement in which ideals and secularity collided, modernity and tradition intertwined, and the unique politics, culture, customs and customs of the Tang Dynasty were demonstrated through the eyes of a modern woman. Showing a different Tang Dynasty, a different Li Shimin and Princess Jier...