With all her talents in music, chess, calligraphy, and painting, how could she be a supporting character?
What makes someone a supporting character?
Dying before everyone else and having no men fight over her. That doesn't suit someone with beauty and brains like her.
As a supporting character, she was terribly worried that the tragedy awaiting her would happen again, so she carefully tried to please the protagonist.
"Zhuang Qing, don't you want to win the regent's heart? I'll help you. That'll speed things up."
As long as the heroine was happy, she could stay alive.
"Zhuang Qing, based on my many days of following the regent, I've concluded that you're not his type. You should change your approach."
Just put in a little more effort. No man is impossible to win over.
But even though she got the direction right, how did the outcome end up going so wrong?