Updated from time to time, the two protagonists are female characters, don't get me wrong.
Social phobia is a mental illness in which patients have lower self-esteem than ordinary people and become unconsciously nervous or even speechless when facing strangers. They do not like to communicate with other people (unless under special circumstances). The lifestyle of such people will have their own uniqueness (their own way of life) and may also be somewhat repressive.
"I'm just an ordinary person"
Concept: A person has two sides