I Transmigrated as the Cannon Fodder Villain

After being transmigrated into the favorite web novel series of his little sister, Gideon who had now possessed the body of the cannon fodder villain must stay on the Protagonist’s good side if he wants to avoid this villain’s original fate where he got locked up in the worse possible prison in the kingdom with no conclusion of what exactly happened to him there.But oddly enough the protagonist seems to be more… docile in person?“Is this really the protagonist?”Perhaps it’s because of the people that surrounded the protagonist that made his heart turn black in the original novel? Then I should make sure to prevent him from turning into the scum he is