The Empress Sent Away for a Political Marriage

How could two people who clearly love each other still fail to understand one another? She was the noble princess of the Celestial Dynasty. She refused to marry in place of her stand-in and instead volunteered to marry for peace. But on her wedding night, it wasn't her husband who entered the bridal chamber, but him, frivolous and mischievous. And it wasn't her who won his favor, but her attendant. He was a prince of mysterious origins, burdened by the enmity between their nations. He had deceived the world, taken control of all power, and plotted a great upheaval. Yet her arrival made him waver. She concealed her illness to help him protect his country, while he hid his true identity, intending to seize her father's throne. When the truth comes to light, how will she bear it? When her illness is revealed and no medicine can help, how will he face it?