I Met The Male Lead In Prison

I Met The Male Lead In Prison summary:

I met the male lead in prison.
Okay. I get that I transmigrated into an R-19 tragic romantic novel, but why is he like this?
“Bark! Bark! Bark! Grrrrrr…”
I can’t believe this guy is held by a curse that makes him act like a beast…And that’s not the end of it, because when he returns to normal for a moment.
“I-i-if you aren’t g-going to take responsibility for what you did to me, th-th-then don’t t-touch me!”
At any rate, I felt relieved that I probably wouldn’t have any sort of romantic interactions with this guy.
A year later…
“Th-th-the day I leave this place, please…m-meet up with me!”
Well it wouldn’t be a big deal to meet him once. But, then, when I was released from prison…
***
“Welcome back. My lovely younger sister.”
The day of my release, a man approached me. Turns out, I’m the villain’s sister.
“You must have suffered going to prison in my stead. I waited only for you.”
…F*ck. My brother’s the male lead’s sworn enemy?
***
3 years later, I met the male lead. He looked totally different than when I last saw him.
“It’s been a while, Iana. I’m going to kidnap you now.”