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?