Eastern physiognomy has long served as a key humanities tool for reading personality and predicting fate. Far from mere superstition, it is an empirical science reflecting statistical correlations compiled over millennia. At its historical heart lies the legendary text 《Ma-ui Sangbeop (麻衣相法)》, written by Master Ma-ui of the Song Dynasty. Master Ma-ui lived in a stone cave on Mount Hua wearing only hemp clothes, studying facial bone structures and Qi flows. The text's core wisdom lies in 'Having a face but no heart, the face disappears as the heart goes' and 'Having no face but having a heart, the face is created as the heart goes'. It emphasizes that character and inner virtues matter far more than fixed physical traits. Modern AI facial analysis uses computer vision to quantify these traditional indicators of facial proportions and symmetry, transforming classical wisdom into scientific metrics.