My Life Was Miserable and I Traveled Through Time to Become a Miserable Stepmother.

**: Jiang Nuan opened a simple school in a partial courtyard to teach literacy and arithmetic to children in the government, attracting Su Jingchen to hide outside the window and eavesdrop every day. What amazing talent will the policy article he inadvertently left reveal? - **The Mystery of the Art of War**: When Jiang Nuan was tidying up the study room, she discovered that Su Jingchen was secretly reading the book on the art of war left by her father. When she placed the treasured annotated copy of "Sun Tzu's Art of War" beside her child's pillow, what secrets would the letter that fell between the pages reveal about the Su family? - **Darkroom Account Book**: When Zhao De'an sneaked into the secret compartment of the study late at night to take away the real account book, he didn't know that Jiang Nuan had mixed special powder into the ink. How would the traces left by his fingers guide Jiang Nuan to find the key evidence that Su Wenyuan was corrupting the ink?