In the Late Stage of Cancer, I Traveled to Another World and Became a Funeral Immortal

Playing the Role of Younger Brother Is a Gift from God.

I have seen a guy who played the role of a little brother, named Zhang Haiguan (the protagonist), who has a gift from heaven. There was a plot before that he recorded his own things in a notebook to prevent himself from forgetting things, and then it was recorded live, but I forgot which book it was. Could you please give me some advice.