After the Chanyuan Alliance, Song and Liao became brotherly states, ushering in more than a hundred years of relative peace between Song and Liao. But the secret war on intelligence never stops. The four major forecourts of Xiongzhou, Bazhou, Ansu, and Guangxinjun are not only the trading places for merchants, but also the places where the intelligence workers on both sides have the most intensive activities. Lin Ji, a tea merchant in Qinghe, has a huge debt of 100,000 yuan and is desperate. On the surface, he was engaged in the serious business of fragrant tea; secretly, he dismantled ironware into parts and hid them in tea boxes, mixed saltpeter into the spice layer, smuggled banned military supplies into the Liao Dynasty, made huge profits tenfold, and licked blood from his knife edge. With a secret order, he was secretly recruited by Xiongzhou Jiyi Division and became a civilian assassin. From then on, every caravan entering the Liao Dynasty was a desperate spy - the number of troops stationed, the location of food and grass, the transfer of generals, the information was hidden in the mezzanine of the goods and sent back to the Song Dynasty in exchange for bounties, asylum, and the right to live. Liao spies were eyeing him, border gangs wanted to eat up his trade routes, and the Song Dynasty inspectors were sharpening their knives behind his back. But Lin Ji has three iron rules in his life: don't practice martial arts, don't take sides, and only keep backup. He used his calculating brain to do espionage and his life-saving instinct to plan an escape route. When it's time to cooperate, welcome people with a smile, and when it's time to backstab, show no mercy. When the secret agents of the Privy Council of the Liao Dynasty forced him to be a double-sided chess piece, and when the news of the reinforcement of troops at the border came - everyone was betting on which side his nail would be nailed. He just wanted to pay off his debts and save his life, but he ended up becoming the sharpest hidden sword in the Song Dynasty, the most troublesome spy in the Liao Kingdom, and someone who no one dared to touch at the Xiongzhou border.
