The two years of Yu Ichika's life had mentally left her with depression and sadness. She was unable to cope up with the fact that she would never be able to carry a child. When they adopted Nana, she gained back her color and vigor but still couldn't completely let go of her inability to conceive.
When the twins were born, she was way over the moon. She thought that that last gap in her life was filled too. So, now she didn't want anything to happen that could ruin their family after waiting for such a long time.
She couldn't believe that Yu Tengfei did this. He was always there to support her, he always loved her so much. It was impossible for him to betray her. Her stubbornness led her to blame Nana.
She came forward and slapped her hard.
"Why Nana? Why did you do this?", she cried, "How can you be so vicious?"
Nana was stupefied. The loud sound of that slap resounded in her ears. She stared at her blankly.
The twins got more frightened and hugged her tightly.