Indebted - Winrina

In a world where debts are paid in flesh, silence is the most valuable currency.

When her father's fatal mistake brings the devastatingly powerful Yu Family to her doorstep, the quiet, introverted Kim Minjeong watches her world end in a single, bloody breath. Spared from the slaughter not out of mercy, but out of cold calculation, she is taken as living collateral by the heiress, Yu Jimin (Karina). Dragged into a glittering world of opulence and violence, Minjeong must navigate a gilded cage where one wrong word could mean death, and where her captor's chilling interest in her may be her only path to survival.

#1 haha
I guess...