Hello!
The series "Blast from the past" is a timeline continuation of a mission pack of mine called "I sold my soul to the devil" that can be found in the storyline section of the DYOM website.
It is advised to first play through that mission pack first to have a better understanding of the story.

In this series, you are playing as Pedro Alvarez, a leader of a small drug and car smuggling business in Los Santos, whose brother has been killed by an underground kingpin. Pedro who came to Los Santos to take revenge, soon comes to realize his revenge will have to wait...