I Raised a Villain

I became an extra in the novel I wrote! The only thing is, it's not a romance fantasy but a martial arts story...
'But that means I get to see the male lead from my own work, right?!'
With my positive mindset, I’m on the lookout to find my baby (?), Yong-an,
but instead, I run into his twin brother, the future villain, Danmok-bi, even before I meet the male lead, Danmok-chang.
But right now, when the original characters are still kids, Danmok-bi is just a frail little boy in his teens,
who is emotionally and physically worn out from experiencing the villain’s backstory.

So I made a promise: 'I’ll raise you so you won’t become a villain.'
I tenderly carried this poor young master, abandoned by his family,
but when I thought I could step back with pride after seeing him grow up...

“Why did you run away, Yeon-ah?”
His bright smile was terrifying,
“Since you raised me, you have to take responsibility, Yeon-ah.”
It looks like that villain has no intention of letting me go.