The Substitue Groom is a Mafia Daddy

Burdened by her father's mountainous debt, Anna has no choice but to enter a forced marriage with Valentin, the ruthless, iron-fisted head of a powerful mafia financial empire. Cold, domineering, and accustomed to absolute control, he is a feared tyrant of the underworld—until a fateful accident leads Anna to his private BDSM chamber, pulling both of them into a tense, dangerous dance of desire and submission.