The Heroes Who Executed Me Are Obsessed With Me

Story is just like it's synopsis which is of only one line, they're all running in circles they who were heroes of the world known as strongest of the all humanity are fighting themselves over execution of their friend who was also a hero who in secret has been brought back to life to make him a demon lord as he was betrayed by mankind. How did it even come to it that empire was able to kill them so easily, if empire was soo strong to begin with then how did these soo called heroes got their title, tia could have wage war or resist asking for other nations for help. Being a hero you always have authority to ask for help from other nations. Tooo many loop holes in the starting of the chapter as I have read till chapter 20 and TIA specially is too lost for idk which reason saying clay (MC) betrayed them first idk how....blah blah blah...dumb and suspense which is not even needed.