Whose credit is it?

When asking this question, Liam Carter stared into Zheng Yongxing's eyes.
He felt that Zheng Yongxing should know about this.
Sure enough, Zheng Yongxing's eyes flickered.
Then, Zheng Yongxing smiled helplessly and said, "Liam Carter, I really don't know where your father went.
If I knew, how could I not tell you, right?"
"Did my mother really die in a car accident?"
Liam Carter asked again.
Zheng Yongxing's eyebrows jumped, and he laughed dryly: "Boy, since the Defense...