The Stepmother Keeps Stealing the Male Leads

Han Yena, a poor job seeker. After being hit by a truck, she wakes up inside The Perfect Lady Angelina—as Helene, the villainous stepmother of three extra sisters.
Because of their stepmother’s indulgence in luxury, pleasure, and gambling, the eldest dies of illness, the second disappears into the mountains, and the youngest goes missing entirely…
But wait, the original story is a reverse harem romance, overflowing with male lead candidates!
‘Why not steal the male leads and marry them off to the sisters of the Emeldia family?’
My dear, unexpectedly acquired daughters, I will make sure you find happiness with the ones you love!
“I’ve never once considered you my mother!”
“Why are you pretending to be a parent now?”
…Of course, it won’t be easy.
And to make matters worse, Liliana, the eldest, is in love with Grand Duke Sieghardt—one of the strongest contenders for the male lead. How am I supposed to steal away a man who already loves the original heroine?
***
“What’s your business idea?”
“Child-rearing.”
Blaine Diark, the world’s wealthiest tycoon—who never misses a chance to criticize Helene and would love nothing more than to ruin her.
“I want to invest in your business.”
Blaine, known for being so cold-blooded he’s said to have no heart, suddenly starts showing an intense, devoted love for Helene.
“…I can’t stop thinking about you.”
What?
“Rejecting me won’t work. It won’t change my mind either.”
Wait, aren’t you one of the original male lead candidates too?! Why are you acting like this toward me?!