Fu Lei's love for his son is deep: "Dear child, I wanted to write a letter the day after you left. I was afraid that you would find it annoying, so I just let it go. But I don't miss you every day, every morning six or seven I woke up at one o'clock, tossing and turning, unable to fall asleep, and I couldn't explain why. It was like Christophe's mother was staying at home alone, recalling the scenes of her child's childhood. Your mother and I always thought about you when you were two or three years old. A short story from when I was six or seven years old."

The previous sentence is excerpted from "Fu Lei Family Letters", which was written by Teacher Fu Lei to his son Fu Cong.