After a breathtaking proposal by a waterfall, Mercy and Hiro are ready to make their final surrender. As they prepare to stand before the world as one, a final test awaits. The desire, devotion, and passion that define their love are about to face the ultimate challenge. As Mercy prepares to surrender to her new world, a sinister force from within threatens to shatter their dreams. Hiro's sister, Serena, a woman consumed by jealousy and rage, takes a final, desperate act of betrayal that puts Mercy's life in danger. With Mercy gone, Hiro must use every tool at his disposal - from his military training to his family's immense power - to find her. The rescue is an act of defiance, a violent testament to a love that will not be broken. The final act of their love story is not just a triumph over darkness, but a life they never thought possible. Their Cardinal Vows are more than just words - they are an unbreakable bond of faith that will change their world forever.