The relationship between the male and female protagonists needs to be promoted, so they appear
The male and female protagonists needed help in their careers, so they appeared
...
They are just tools around the male and female protagonists, being laughed at, compared to, and abandoned...
They were once knowledgeable, gentle and pleasant, or they were arrogant, cold and charming.
But no one cares, even these qualities become shackles and a reason for rejection.
Purpose: girls help girls