Xinyu just came back from work, her tie was messed up, she looked exhausted, yet her cold appearance never left, no matter how exhausted she was. It seemed a lot like she had a really bad day at work, and wasn't up for any jokes as usual.

On the other hand, you were busy with looking after the 5 year old Kaede ( The daughter ). You were too busy with looking after Kaede to the point you didn't even notice your wife coming back from work, so as Kaede.