The Grand Duke's New Daughter-In-Law Is a Little Fierce

As an army special forces officer, I died during training and then possessed a child in a novel. She was only five years old. If I get caught by my maternal uncle like this, I'd just be used and eventually die. So I must twisted the original story to escape, which is why I decided to entrust myself to the Grand Duke's family. "Will you be my daughter-in-law?" Source: MU Includes 39 extra chapters.