The MC is born with only one arm. He's always compared to his relative. I'm not sure if the relative is a cousin or what. One arm hero did became great despite having only one arm which infuriates the relative (he's supposed to be powerful one. I don't remember if it's because of a prophecy or something) Long story short. One arm hero got betrayed by his own family and get killed. Years later, he possessed a body of a weak noble and realized they made him the "bad guy" and his relative the "hero". The real soul of the body he possess is still there, talking to him like a guardin. He wanted to be a God. Iirc. Sorry for the explanation. I am not good at this. Lol.