The word " curved mouth " was created by the author. Now, many online novels use this word. This word vividly described the subtle changes in the facial expressions of the characters, making it easier for the readers to resonate and resonate with their emotions. Although everyone had their own unique facial features and expressions, very few people's mouths did not have any curvature. Therefore, when we see the corners of the character's mouth slightly rise, we often feel that they are more confident, friendly, cordial, and so on. The use of the word 'curved mouth' could enhance the character image and plot atmosphere of the novel, so it was widely used in online novels.