Zhao An, a soldier at the border, rescued the eunuch of the supervisory army on a snowy night, uncovered a traitor and stabbed his superior in the throat with a spear. He thought it was to protect his family and country, but he found that he was just stepping into another bigger war - the court.
Why should a mud-legged man who crawled out from the pile of dead people fight with those wealthy and wealthy families? Rely on military merit? No one in the court saw him fighting. By marriage? The concubine of the Prime Minister's Palace is his only bargaining chip. By taking sides? He chose the weakest third prince.
Everyone laughed at him for overestimating his abilities. Until he used his knife to teach them a truth - on the chessboard, even if a pawn crosses the river, he can win.