There is No Villain in this Novel

I鈥檝e 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鈥檓 not the real owner of this body, my family will have me killed. I can鈥檛 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鈥檛 mind being a useless idiot.I tried to turn over a new leaf, but the protagonist keeps looking at me strangely. What鈥檚 going on? Are they trying to make me turn over a new leaf?