[Help] I can’t find the title of a manhwa

So I’m trying to find a specific manhwa. It’s about a hero failed to save his world and was sent back in time (I know so unique) but instead of continuing from there as a hero he literally becomes a monster to save his world. He was given a choice to become a hero or a monster to save his world and the first time he was offered the choice he chose hero but when he was sent back in time he chose monster. Does anyone know what this is that I’m looking for?