Zhai Hua patted the seat next to her. "Have a seat over here. You graduated from college today. Congratulations. Will you be angry that I didn't go?" Since she was at home, Zhai Hua wanted to attend Qiao Nan's graduation ceremony. It was such an important occasion for her.
Actually, the reason why Zhai Hua was at the Zhai Sheng's residence instead of the army was that, like Zhai Sheng, she took time off to attend Qiao Nan's graduation ceremony. This was a very meaningful occasion.
Everyone around Qiao Nan had the tacit understanding not to mention the Qiao family at such an important day.
Since the Qiao family could not be there and be happy for her like what elders would, the Zhai family must make sure that they could be present to congratulate Qiao Nan. That was why Zhai Hua returned to the Zhai family's residence one day earlier than Zhai Sheng.