It's really quite a coincidence, Shang Feifei and Xia Siyu finished filming around the same time, and their projects wrapped up around the same time too. During these past ten plus days, Xia Siyu and Bo Yan were apart, Han Yifan was also dragged away by his father, and he's been incommunicado ever since.
Shang Feifei didn't have deep feelings for Han Yifan to begin with. They got together somewhat confusedly, and though being together didn't feel too bad, once they separated and left that environment, the emotions that surged up like a feverish cold instantly dissipated.
During these ten plus days, she was also very busy. Han Yifan did try to contact her, but without meeting face to face, her responses became more rational and restrained. Every time she replied to him, she wondered more and more how she ended up with such a man in the first place. They simply weren't on the same page at all!