I had to return.

On the other side of the city, Zhang Xiaotong was walking back and forth in her room with anxiousness on her face. She was holding tight to her phone as if she was waiting for someone's call. After a while, her phone finally showed the hints that relieved her. But before she could receive it, it was disconnected. 

Her brows tugged in a frown as without giving any moment of thought to it, she returned the call to begin with a tone of desperation. "What do you mean by that? Do you know how long I have been waiting for your call?" 

"Xiaotong …" Before the person could speak from the other side, Zhang Xiaotong interrupted to say.