In his previous life, Shen Yan was a master of stock market trading and a top player in Texas Hold'em poker. Once he passed through Bianliang in the last years of Zhe Zong's reign, he became a down-and-out man with 30 gambling debts. It coincides with the endless party disputes and the emergence of border troubles. The decline of Liao Dynasty and the rise of Jin Dynasty are eyeing it. Yanyun's homeland has not been restored for a century, and the shadow of Jingkang's shame has spread in the dark. From the gambling table to the court, from the trade route to the battlefield, Shen Yan adheres to the essence of the game of "stopping losses to win, checks and balances as the way", using business to support the army, and using strategy to determine the country. He does not seek power over the world, but only seeks to protect Yanyun's homeland and protect the people of the Song Dynasty. Finally, he became the magic needle of the northern border and wrote a wonderful legend of protecting the country!