Letter to Relatives

This is what a 38-year-old father wrote to his 5-year-old son while he still had some time when he was about to leave. The father doesn't know what will happen to his son in the future, or whether the two will meet again in the future, let alone what kind of person his son will become in the future, but he can't let go. He wanted to leave these five years of father-son time and his life experience to his son in the form of words, and said to him, I'm sorry, I couldn't accompany you to grow up. This is also a 38-year-old middle-aged man looking back on the first half of his life. These are the words he wrote to his past self, his future self, and his relatives.