The Country Is About to Perish, Why Hasn't the System Awakened Yet?

The modern elite Li Xuanye traveled through the Tang Dynasty, but his country was destroyed and his family was destroyed, and he became the wanted prince of the subjugated country. In a desperate situation with no system around him, he relied on his modern thinking and heroic qualities to endure and hibernate, contact his old troops, and ignite the fire of national restoration on the ruins. However, the power of the new dynasty was ruthless, with large armies outside and spies inside, forcing him into desperate situations several times. At the moment of life and death, he met Bai Wanqing, a traveler from another world who carries the "Invincible War System". The two teamed up to complete a shocking counterattack in the decisive battle of Chang'an with the power and strategy of the era. In the end, Li Xuanye eliminated the enemies and rebuilt the prosperous age, and promised to find his way back together with Bai Wanqing.