A Note That Spans Time and Space

In the early morning, Liu Hai and Wang Xin sat at the dining table as usual at breakfast time, holding chopsticks in their hands holding buns. The two of them took a bite of the buns and sat there for a while, looking absentminded. Their son is about to take the college entrance examination, and because his grades are not good, they feel a little heavy. Of course there is another reason, the recent surge in tariffs... After a few minutes, it was time for their son to get up, but the two found that their son was not moving. Just when Wang Xin was about to get up and wake up his son, he suddenly found a note appearing out of thin air on the table in front of him, with a few lines of words written on it. "Husband, look at this piece of paper. It's not here, is it?" "Huh? What kind of paper?... Well, it shouldn't be here. I remember it was empty just now." After hearing this, she was surprised and picked up the white paper and read it carefully. She screamed before she finished reading. "Husband, look, it's written by my son!" She hurriedly handed the note to Liu Hai, got up and walked quickly to her son's room...