Love is sometimes like an equation. Some people find the solution from the beginning, while others are always confused. Some people have found it but deceive themselves and others and refuse to admit it. Some people shrink from solving the equation from the beginning. He and she were originally parallel lines that did not intersect with each other, but due to chance, their trajectories changed, from parallel lines to intersecting lines. When he met her, he knew he had found his solution. When she met him, she became a liar who deceived herself and others. What kind of formula can be used to solve this love equation?