Kim Taehyung had everything-wealth, success, and a family he once believed would last forever. But one betrayal shattered it all. After discovering that his wife had been unfaithful and that the little boy he had been raising was not his biological son, his world fell apart. When she abandoned them and disappeared with her lover, Taehyung chose to keep the innocent child, Kim Taejoon, and raise him as his own, believing that love-not blood-makes a family. Years later, Y/N unexpectedly enters their lives and quickly becomes the person Taejoon cherishes most. Seeing his son's happiness, Taehyung proposes a marriage of convenience, determined to give Taejoon the family he deserves. But while Y/N accepts the marriage with sincerity, Taehyung keeps her at a distance, refusing to trust or love again after the scars left by his past. As Y/N fills their once-empty home with warmth, kindness, and unconditional care, the walls around Taehyung's heart begin to crack. Slowly, a marriage that started as a promise for a child turns into a journey of healing, trust, and unexpected love. But can a man haunted by betrayal truly open his heart again? And can a woman who asks for nothing in return become the reason he learns to believe in love once more?