In the glorious Zhenguan era of the Tang Dynasty, the land is peaceful and prosperous, and the Li family reigns supreme. Li Jing defeats the Turks in the north, and Emperor Taizong conquers Goguryeo in the east, their military might shaking the world. Amidst this backdrop of triumph, a young man in simple clothes observes the imperial palace bathed in the setting sun, a smile playing on his lips. This is a story set during one of the most magnificent and prosperous periods in Chinese history.