Her Billionaire's Revenge

The female lead was helped by the male lead. He faced difficulties due to his poor background. Years later, the female lead is a successful businesswoman, determined to protect him. The male lead is schemed against by his fiancée's family and has his business stolen by competitors, facing crises. The female lead steps forward, helps him reclaim his business and settle scores. They start a business together, fighting opportunists. Past kindness is reciprocated, with mutual protection.