Irina, a girl whose eyesight and lifespan were taken away in exchange for the supernatural power to read people's hearts. Because of that power, she was treated as a "tool" by her family and lived with a closed heart. However, only one man, feared as the "Cold-hearted Emperor," noticed her kindness and loneliness and quietly reached out his hand. Knowing for the first time what it means to be "protected," Irina firmly vows to dedicate her remaining short life to him this time. When a shy and cowardly girl gathers her courage to take a step for someone precious, her feelings eventually involve those around her and even change destiny.