Become Stronger by Following the Strategy, Starting with the Broken Spirit Girl

My eldest brother died young, and my young and beautiful sister-in-law and I depended on each other. My mother forced me to marry my sister-in-law every day: "Kiss keeps getting married, and the wealth will not go to other people's fields!" I was extremely helpless because I was carrying a shocking secret. The introduction is too weak, please move to the main text.