The concept of facial attractiveness in the field of plastic surgery has been defined as bilateral symmetry and arithmetic balance. However, there are many studies proving unnoticeable facial asymmetry(anatomic asymmetry) in normal population and even in the beautiful face. 
 Humans also have asymmetry(neurologic asymmetry) in the visual perception of other's face, and this phenomenon used to be explained by hemispheric difference of human brain. Surprisingly, nobody had been interested in the relationship between the anatomic and the neurologic asymmetry phenomenon of human face until the middle of 1990's  when some studies revealed that the perfectly symmetric face is less attractive than the minimally asymmetric face of normal population, and other studies suggested the right side of human face is more attractive than the left side.  
 These phenomena of anatomic and neurologic  asymmery contribute to human face felt more attractive, and ultimately, could be related to the evolutionary theory as a biologic system to show the high fertility in the female.  
 We could not describe the attractiveness of human face with bilateral symmetry or arythmetic balance. This article presents various aspects on the facial asymmetry shown in normal population, and explains what the beautiful face would be.