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The male protagonist Li Renzhong runs his own engineering company. When I was nearly 40 years old, I encountered a relatively large project sales opportunity and at the same time encountered a marriage crisis. While insisting on project follow-up, he encountered many obstacles and setbacks. In the process of gradually straightening out the project relationship, he gained the favor of Cao Bingbing, the daughter of the decision-maker of Party A. Through the help of friends and persistent efforts, he finally defeated all competitors and won the large order of the Yellow River Tower. Li Renzhong himself also paid a huge price for this, with the final breakdown of his family, the departure of his lovers, and the killing of his competitors. Highlights of this book: It not only tells the marketing strategy of business follow-up, but also describes each poignant love story. At the same time, it criticizes the dark side of society. Just as the title of the book "Black and White Keys" expresses the intention: society is like the keys of a piano, with black and white, success and failure, love and hate, heartache of broken dreams, and longing for happiness.