The Time Traveler in My Eyes

I. A traveler speaks of a parallel world, where natives are born and raised; There is no golden finger to carry around, and [life] is not as hard as those who travel through time; I tried my best to avoid him and her, but we always met by chance; The reason why I am still alive today is because I read a long letter in a diary, titled "The Protagonist's Notes", written by the last time traveler in the male channel. Why is it said to be the last one?