Chen Lin was originally a military history enthusiast in modern times, but accidentally traveled to the world of Tian Long Ba Bu and became the adopted brother of Qiao Feng, Xu Zhu, and Duan Yu. He woke up outside Yanmen Pass, just as the Liao army made a small-scale tentative invasion of the Song Dynasty border, and the people were displaced. Chen Lin relied on the military knowledge accumulated in his previous life to help local people build simple defenses to resist the harassment of the Liao army. After learning about this, Qiao Feng and others came to help. The four brothers fought side by side for the first time and successfully repelled the Liao army. Chen Lin's knowledge and strategy impressed the three brothers. Tip: There is a story about four brothers and their children in the follow-up. In addition, please do not read this article as the original work. This book uses the framework, characters, and martial arts system of Tianlong's original work, but there are many creative creations in the plot. Don't be offended if it does not conform to the original work.