High school student Xiao Ruan likes her long and black hair; after she learned that the new school has a rule that girls must keep short hair; she decided to use the wig to disguise herself. Jiang Yu, the monitor who has been protecting herself with a wig as well, could easily see Xiao Ruan’s secret and they became good friends, but when the two girls secretly rejoiced for their success, Jiang Yu was discovered by the head class teacher.