Here it is, dear reader. I have revealed to you the pains of the convicts who are suffering from regrets. Each of them learned to value all the treasures of life, the passing moment, and time. In particular, they are waiting months and days to be released and walk freely to return to their families as soon as possible. No one should be lucky enough to sit in such places! As I wrote these letters, I cried when I read that someone had been arrested repeatedly. I could not ignore the letter. Because behind each letter, it was as if a person was standing with his eyes closed. I wrote this book with the intention that after reading the real events in the letters, someone would learn a lesson and not enter the heinous street of crime.