1. Inconsistent words and actions: Appearing extremely serious and serious in front of outsiders, but may have interests or behaviors that are completely different from their surface image in private.
2. Overdisguise: Deliberately hiding one's true emotions and thoughts to conform to society or others' expectations of "seriousness", often maintained through deliberate language and behavior to maintain this image.
3. Lack of sincerity: It is difficult to show one's true self in communication, often maintaining a certain distance and reservation towards people and things, making interpersonal relationships appear superficial and difficult to deepen.