Book 1 : The Soldier.

"A life for a life," He mumbled, voice barely audible. "My debt is repaid. Move out!" He called to the soldiers, not giving her another glance.
Mulan, having been "spared" death by Shang, remained on the cold mountain, wearing nothing but bandages around her torso, thin pants that could barely protect her legs, and the blanket she was holding when Chi-Fu dragged her from the tent. Her wound reopened, bleeding profusely-Mulan didn't expect to survive much longer. Instead of death, she was found by the Hun army, the enemy. At first, she believes the blood loss caused confusion, hallucinations, a delirious mindset. That was until she woke up in their camp, fresh bandages and their leader staring from across the campfire. He gave her a choice, leave and spend the rest of her life in fear of him for killing his army, or stay, help him destroy the army that betrayed her, abandoned her and be promised a quick, painless death after. Mulan doesn't know why she chose to stay. Maybe she was still weak from her injury, maybe it's because she knew she could never outrun him, perhaps it was revenge, survival. Or it was because the so-called enemy treated her with more respect than her own country, the very men she saved the lives of.