As a child, Isabella Hart risked her own life to save her best friend, Ian Winston, from a deadly accident. But believing her younger sister deserved happiness more than she did, Isabella allowed Ian to believe that Sophie was his true savior.That one decision changed the course of all their lives.Ian's gratitude toward Sophie gradually turned into love, while Isabella silently buried her own feelings and watched the man she loved drift further away from her. But their lives took a tragic turn when a devastating accident left Sophie unable to walk. Overnight, accusations spread, and Isabella became the target of everyone’s blame. Even Ian believed she had ruined Sophie’s life.Consumed by anger and revenge, Ian married Isabella not out of love, but to make her pay for hurting the woman he thought he loved.For years, Isabella endured a painful marriage filled with coldness, resentment, and heartbreak, loving a man who looked at her and saw only betrayal. Then the impossible happened: Sophie returned, fully recovered and determined to reclaim Ian.Without hesitation, Ian handed Isabella divorce papers, never knowing that she was carrying his child.Heartbroken but unwilling to remain trapped in the past, Isabella disappeared and started over with nothing. Through hard work, determination, and years of sacrifice, she transformed herself into a powerful CEO and the founder of a rising business empire.Years later, Isabella returns stronger, richer, and no longer the quiet woman Ian once controlled.But as hidden truths begin to surface, Ian discovers a devastating secret: Sophie was never the one who saved him.It was Isabella.Suddenly, every memory, every decision, and every mistake comes crashing down around him. Consumed by regret, Ian becomes determined to win back the woman he spent years destroying.But Isabella has changed.She is no longer waiting to be chosen.And with another man entering her life and a child Ian never knew existed standing between them, Ian must face the painful consequences of his choices.Will love be enough for redemption… or will losing Isabella become The Billionaire’s Greatest Regret?