Functional Relationship Between X and Y

X: independent variable [I am Xiao Cen, the sports committee member of the class. I have a girlfriend, and my relationship is uncertain. Y: dependent variable [I am Qin Muxian, known as Lao Muxian. I can be said to be the most cheerful person in the class. When X and Y accidentally intersect to form a function, do you think X depends on Y or Y depends on X? ————————————————————————————————————————————— : This is just a story about health and evil (?)