It Was a Mess at the Beginning, but I Counterattacked at 70

[Military Marriage + Era + System + Marriage First, Love Later + Young Lady + Seize the Opportunity + Reborn as a Book Girl] Rich girl Xia Wanqing traveled through time and became the sick eldest daughter of the Shanghai capitalists in the 1970s. The beginning is hell: the scumbag father joins forces with the stepmother, locks the door and lets the gangsters destroy her innocence, forces her to go to the countryside with a bus ticket, and even uses chronic poison to make her die of illness... However, they didn't know that the original owner of Sha Baitian had changed her mind, and the illegitimate daughter they held in their hands was also a "Xibei product." Xia Wanqing holds the "All Things Analysis System". No matter how you frame her, she can resolve it one by one. No matter what poison, secret room, blueprint, mind reading... This is my confidence. However, opening system functions and shopping malls requires growth time and resources, and her identity also needs to be changed. Xia Wanqing did not hesitate to flirt with her fiancé, a military officer who wanted to break off the engagement. "You have to take responsibility after hugging and kissing me, and I am willing to use my grandfather's life-saving grace in exchange for your four years of shelter!" Xia Wanqing cried, tears streaming down her face. "Okay, during this four-year agreement, you are not allowed to interfere with my personal life, you are not allowed to do things I don't allow, you are not allowed to cause trouble, and you are not allowed to entangle me after four years!"... However, how come this young lady who cries all day long has such a good brain? She uses her knowledge to turn stones into gold; she uses her medical skills to save lives and heal the wounded; she also uses her analytical skills to catch enemy agents and save the country's losses... Xia Wanqing: I also ruined the good marriage of the bitch who passed through the book; I snatched the golden finger of the reborn person, corrected her three views, killed the stepmother, and arrested the scumbag father... But, what about the agreed marriage? Why don't you keep your words?