That was the difference in everybody's character.
Eevonne looked like a ferocious person who loved to quarrel with others. She seemed like she would never conform with the group, and she was even said to be a psycho. However, deep down, Eevonne was an incredibly soft and weak person who did not know what to do. That was what led her to be continuously passive and end up being looked down upon by others. On top of that, just like what she had said, she had indeed once been vain.
However, Sabri