”Rankou,” is the fake moustache in Peking Opera, Though it seems that a character's ”Rankou,” was put on according to his age, the final decision was made on a proper appearance of a certain role type. ”Rankou,” will change depends on character's ages in plays, or other biological or genetically reasons. The change from one role type to another will coherently influence the design of hair and moustache, but in most cases, a character will be categorized into one role type than can make the two different costumes persuasive. In this sense, ”Rankou,” is usually to be seen with ”Jing”, ”Chou”, and ”Laosheng”. Sometime it will be used in some special circumstances. The different adaptations are part of the mutation in Chinese's opera's stylized performances.