Mafia Stepbrothers & Undercover Stepsister [BTS FF]

"She was trained to destroy them. Fate made them family."

Baek Areum grew up longing for something simple-older brothers. The kind who'd ruffle her hair, glare at her crushes, and protect her from the world. Just deep down. Instead, she had a cold childhood wrapped in shadows, raised by her father-an elite spy high ranked officer in a covert government organization targeting South Korea's most dangerous crime syndicates.

Their #1 target?
The Bangtan Mafia. And the main masked faces, the seven, who handled different brancehs of the syndicate.
Seven kings of the underground. Unmatched. Untouchable. Until now.

But when her father is killed under suspicious circumstances, Areum's world collapses. The agency turns silent. The mission is buried. And the only lifeline she has left is a phone call from the mother who abandoned her a decade ago.

The catch? Her mother is now married to one of Korea's wealthiest men... and Areum suddenly finds herself with seven new stepbrothers.

Cold. Charismatic. Deadly.
And all too familiar.

Because these aren't ordinary brothers.
They are Bangtan-the very men she was raised to infiltrate and destroy.

Now trapped in a mansion lined with secrets and scars, Areum must hide her identity, dodge suspicion, and survive living under the same roof as the seven criminals her father died trying to expose.

But as tensions ignite, secrets bleed, and forbidden bonds begin to form...

#Started: June 9, 2025

#Ended: ---