The story takes place in Shanghai, where various forces were intertwined during World War II. A female spy disguised as a student gets close to Mr. Yi's wife in order to obtain intelligence from the other side, but ends up falling in love with Mr. Yi. Although it is a spy novel, most of its content focuses on the complicated and tangled love between the two. By looking at Mr. Yi's inner monologue in the novel, we can understand the tone of the novel: "He was not optimistic about the war situation. How would he end up in the future? To have a soulmate, he would die without regrets. He felt that her shadow would always be by his side, comforting him. Even though she hated him, her final feelings for him were so intense that what kind of feelings they were didn't matter, as long as there were feelings."