The romance fantasy already had its happy ending.

The prince became emperor, the heroine became empress, and the loyal second male lead was left behind after sacrificing everything for them.

Leon has no intention of repeating that story.

After waking up in the body of the empire's greatest general, he quietly resigns, buys a countryside estate, and watches the "perfect ending" collapse without the man who held it together. While the imperial couple scrambles to contain rebellions and political chaos, the people destined to overthrow the empire somehow keep gathering at Leon's doorstep instead.

If the empire only survived because of a fool's devotion, perhaps it deserves to fall.