Between 1 and 2

Between heaven and earth is life, between life and death is life, between men and women is aliens, so what is between 1 and 2? This book is updated as the occasion arises, and I write whatever comes to my mind. The introduction must be longer than 100 words, so you have no choice but to add a few more words. Ten years ago, I felt that the world was vast and there was nowhere I could go; eight years ago, I felt that I would stand out and achieve great things; six years ago, I felt that the universe was so deep that I wished I could exhaust all its mysteries; three years ago, I felt terrified that the power of heaven was unfathomable, people's hearts were cunning, and I was afraid that I would not know the way back; now, I feel that the world is so big, there is no place to stay, the journey of life is long, and I don't know where my hometown is. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.