On the night of the Mid-Autumn Festival, the fox general Yuwen Hong Ce was ambushed in the Sailun Valley, and his entire army was wiped out. He endured and hibernated, vowing to find out the truth about the corruption of military equipment. On the same night, Wen Ding Yi, the daughter of a high-ranking official, lost her family because her father was falsely accused of collaborating with the enemy.