Traveling back to the Three Kingdoms period, Lu Feng, son of Lu Kang, activates the sign-in system on the day of his engagement to Cai Yan, daughter of Cai Yong. His first sign-in grants him a transformative opportunity, leading him to abandon a life of ease and lead an iron cavalry to fight the Yellow Turbans. Along the way, he acquires divine weapons and skilled generals through sign-ins. Starting with his marriage to Cai Yan, he protects his family, recruits renowned generals, and strives for supremacy in a chaotic world.