Lin Mo, a college student, traveled through time and became the useless sixth prince of the Wei Dynasty. He was falsely accused and imprisoned for saving the crown princess. While he was waiting to die in Tianlao, Empress Beimang led 500,000 cavalry south. His father, Emperor Qing'an, fled south with hundreds of officials, leaving Lin Mo as the scapegoat to guard the city. At the critical moment of life and death, Lin Mo activates the system - as long as he completes the task, he will receive rewards such as troops, food, and weapons. Finally, he conquered Beimang Empress Xiao Yuerong in front of the battle, unified the world, and ushered in a prosperous age.