When they first met, he was an orphan living in the market, and she was a beggar who made a living. She saved him from trouble, and he was grateful; when they met again, he was an enemy spy pretending to be a scholar, and she was still the little beggar. She showed him the way, and he promised to marry her ten years later. In the end, she was the princess of the Gu Kingdom, guarding the empty city alone, and he was the enemy's vanguard general, breaking through the city gates...