The girl's WeChat signature has been changed into a "love letter", which is a personalized signature. Signing a "love letter" represents that this girl is currently in a perceptual state and wants to express her tenderness, romance and inner world. On Wechat, the signature is an important way to show yourself. Many people will express their feelings, attitudes and personalities in the signature. Therefore, the "love letter" is also the emotional expression that this girl wants to tell others about someone or something, and it is to express her inner feelings and thoughts. Generally speaking, the sign of "love letter" does not have a fixed meaning, because everyone's emotions and feelings are different, but it shows that the girl hopes to express her heart through a sign and share her feelings and feelings with others.