The Man I Carefully Chose Turned Out to Be the Villain

I transmigrated into the younger sister of the male lead, who ends up imprisoned after envying and tormenting the heroine.
Rather than not marrying and just pestering my brother's girlfriend, it's better to pick my own man and get married.
There was a promising husband candidate from the start.

There's a boy named Silas who lives next door. He has good potential and looks like a doll.
If he simply grows up into a pretty, well-mannered, proper man, he'll be the perfect husband for me.
So I started brainwashing him when he was a snot-nosed kid.

"Hey, you'd better grow up pretty, kind, and proper, and come marry this noona. I won't let a single tear fall from your eyes."

Unfortunately, due to various circumstances, Silas left.
And I grew up.

---

I also became close with the heroine who would become my sister-in-law.

"...Tercia. Where on earth did you take Alina?!"
"A place you don't need to know about, Brother."
"You, stop hanging out with Alina."

Hmph.
That's right. Why bother getting close to my brother when he'll end up as someone else's man anyway? A sister-in-law is the best.

And I threw myself into looking for a husband.

Then, right in front of me,

"Terry. You told me to come marry you, and now you're on a date with another man?"

Silas had reappeared.

He'd become tall and completely handsome, a top-tier beauty. So I dated Silas in sweet harmony. I did everything couples do, happily day and night.

But then.

"...What's your real name?"
"Calis. Calis Forsite. That's my real name, Tercia."

...Turns out the man I picked out so carefully, my boyfriend....
Was the mastermind who would bring down my family and the imperial court.

I'm doomed.

(Source: NovelDB)