Set Sail from the End Point

An unusual delivery boy. No hope, no goals, no dignity, no self, nothing. A shadow enveloped him when he was not dead yet alive. When he was about to have an accident, a voice from outside prevented the tragedy from happening. "You can't die." A mysterious voice. "Why?" The food delivery guy. "What will I do if you die?" "Am I related to you?" "It doesn't matter. I am your son, but I haven't been born yet." The father and son continued to move forward when the Blue Star civilization reached the end after thousands of years of development.