Da Qin: in the Beginning, We Discussed the Rise and Fall of the Qin Dynasty Across the Wall.

Traveling back to the time when the Qin Dynasty ruled the world, Qin Chuan turned into an unknown pariah to survive. The mysterious Lao Qin often comes to visit with roast chicken and wine, and the two chat about the current situation. Qin Chuan revealed the hidden dangers of the Qin Dynasty with one word, and asserted that in two years' time the ancestor dragon would die and the world would be at war. A two-way game of disguise begins. He doesn't know yet that his old friend is the First Emperor and he is the missing seventeenth prince.