I was shocked by this unusual act. I looked at her and found that she seemed in a good mood. So I asked carefully, "What's wrong with you today?"

She didn't seem to understand what I meant. She asked confusedly, "What's wrong with me?"

"You look like you're in a good mood."

"Okay." She said. "Why did you come back so late?" The tone of

was somewhat resentful, which made me both surprised and even more puzzled. I came back at this point almost every day recently, but she never asked, why did she suddenly say that today?

"Overtime, it's a little late." I said.

"I'm waiting for you to...