Cassandra, who works at a charitable institute, hears the sound of a gunshot in the park one morning and rescues a handsome man named William, who has been gravely injured. He is a courageous war hero―and a noble earl from a prestigious family! Despite his status, he keeps his heart guarded, making Cassandra suspicious. Even when William offers support to her institute, she cannot accept his help so easily. Their worlds are just too different. Meanwhile, unbeknownst to her, William is uncovering a vast conspiracy, and the danger soon begins to creep ever closer to her…