Chen Yu, a modern weapons expert, accidentally traveled to the second year of Xuanhe in the Northern Song Dynasty and became an apprentice in the Bianjing blacksmith shop. Facing the coming humiliation of Jingkang, he relied on modern knowledge to improve firearms, established the "Jing'an Society" business network, and secretly accumulated strength. From the blacksmith shop to the court, he circled among the powerful, deciphered the Jin's conspiracy, and made plans in advance to counter the Jin soldiers' march south. With firearms and strategies, he turned the tide, rewrote history, prevented the disgrace of Jingkang, and opened up a new path for the Song Dynasty to become a powerful nation. This is a battle between technology and power, and a legend that changes history.
