My Sister Ran, So I Married the DonEpisode 3

Isabella saved a mob boss's grandmother. Her sister stole the credit. When the Moretti family demands the real hero's hand in marriage, Isabella's own fiancé abandons her for her sister — leaving Isabella to marry the man they call The Butcher. They say he's a monster. They're wrong. Now her ex won't let go, her sister won't stop scheming, and the most feared man in the city has only one soft spot: her.