I'm Really the Villain, So Stay Away, Fairies

What do you mean, my opponent used to be a genius, but now he's become useless?

What do you mean, my opponent had his Heavenly Spiritual Root dug out from the start?

What do you mean, my opponent's entire family was wiped out, and now he's itching to get revenge?

So am I, a handsome guy with a younger sister but no house, really not the protagonist?

You've got the wrong person. I'm just a farmer. Move along, move along.

(There is cultivation, but the plot leans toward suspense and adventure. There is a System, but it doesn't get much screen time. The story isn't brainless, has multiple female leads, and is comedic and generally lighthearted.)