She Saves All Sentient Beings and I Save Her

She saves all living beings, kills decisively, and can stop three thousand people with one sword. I helped her without asking for anything in return, just so that she could see me when she looked back. Later we found out—— All living beings are bitter, but you are sweet. Outside the world, there is another person who has been waiting for us for three hundred years. I traveled through the novel I wrote and became the lowest outer disciple. The system asked me to survive, but I made an exception for her. This time, the story I wrote, I will rewrite the ending