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normal person (first guy) is mistakenly summoned into a magical world because he had a similar name to an actual hero and the wizard mispronounced it. there's no way to send him back yet and the council thinks the wizard succeeded so they make him go after a big bad evil guy, solving problems on the way there as the guy learns more about magic and the world he ended up in.
eventually the underlying conflict between three immortals, bitterness, and change becomes more and more prevalent as they get closer to the truth about the big bad
picrel, literally the first concept of the hero trio, some of the worldbuilding was done beforehand but I've continued to work on the setting more