Before meeting Tzuyu, Ayun had never felt that the influence of one person on another could go deep into the bone marrow.
After meeting Tzuyu, Ayun felt that she was sick and there was no cure for her illness.
Ziyu is happy and Yun is happy, but Ziyu is worried and Yun is even more worried. Tzuyu hurt Ayun, but Ayun didn't hate Tzuyu.
In the end, Ayun was tired and felt that her life was full of regrets.
And Ziyu's life has been miserable since Ayun left.