The Mafia's Billion-Dollar Regret

Protagonist Aria endured nine years of suffering to pay off debts — miscarrying and being abandoned by her chaebol husband Dominic for a nanny — until she was utterly dead inside and left with nothing. She flees to London and befriends Caleb, a top-tier chaebol heir. Facing her ex-husband's insane efforts to win her back, from arrogant coercion to groveling self-pity, Aria ignores him throughout and strikes back with dimensional force using far higher-level power. When he learns the nanny is pregnant with a bastard, the ex-husband's faith collapses, and he offers half his fortune seeking forgiveness — only to be coldly rejected. In the end, Dominic is stripped of his inheritance by the family and reduced to a bottom-rung commoner, while Aria ascends to twin peaks of career and love.