There is No Villain in this Novel

I’ve been transmigrated into a modern fantasy novel. I pretended to be a supporting character, but I became the ultimate villain.The problem is that I transmigrated before reading the true explanation of the situation. If they find out I’m not the real owner of this body, my family will have me killed. I can’t help but pretend to be the supporting character.However, the ultimate villain who dreamed of world destruction retired today. You guys can figure out what to do with your minds.I don’t mind being a useless idiot.I tried to turn over a new leaf, but the protagonist keeps looking at me strangely. What’s going on? Are they trying to make me turn over a new leaf?