Liu Yi, a history college student obsessed with the history of the Three Kingdoms, accidentally traveled to Jiang Wei shortly after Zhuge Liang's death while studying ancient books. At this time, the great cause of the Northern Expedition of the Shu Han Dynasty was frustrated, and the situation was in a precarious situation. The Yan Han Kingdom Zuo might be destroyed in one day. But as a modern man, Lewis relied on the rich historical knowledge and unique military insights in his mind to break the shackles of history. Can he lead the Shu Han army to regain the Central Plains and rewrite the direction of history in this changing and chaotic era of the post-Three Kingdoms period? A thrilling journey to the Northern Expedition has begun.