In order to solve the family crisis, Chen Wanting, a top-notch actuary, was forced to enter into a "contract marriage" with Yang Kai, the president of a wealthy family. In the workplace game and emotional exploration, the two used mathematical models to deconstruct the paradox of love - "the concentration of sweetness is positively correlated with the depth of injury." When the conspiracy surfaced, they discovered that the most difficult issue was how to prove that each other was the only solution in the midst of falling in love and killing each other.