Honestly, This 13th Regression Is Getting Tough

A brief description of the manhwa Honestly, This 13th Regression Is Getting Tough:
“I’m not going to save the world anymore. I don’t believe in my friends either. If you are an enemy, you will kill anyone. Even if it’s on your side.” 13th time. He saved the world six times, but none of the endings were “right.” The hero turned into a monster in an endless return. Believers are traitors, and the enemy is so far removed and thrown away. He abandoned himself to survive. Are all the regressions the same? This guy is different.