When I was 17 years old, I met a girl who has had a great influence on me so far, and we helped each other out of confusion. I made a promise at that time to write a book for her, and this is the origin of this book. I hope everyone will get what they want, because this book is just a promise, not a masterpiece to be published. I write it wherever I think. If you see some sentences in other articles or similar sentences in the middle, please forgive me. Finally, I wish you all a happy day - 0×1
Motto: There will always be someone who lights up our lives
