Suin Lee, who lived a poor life without parents, suddenly finds herself in a contractual marriage with Cha Dojun, the CEO of the major corporation LN Group, whom she had known since childhood. Although she had secretly harbored feelings for him, she thought the marriage itself would be enough to satisfy her. However, Dojun's cold demeanor, to the point of not even moving into their newlywed home, pushes Suin to her limit. Just as she decides to file for divorce, he begins to change. "I want there to be nothing I don't know about you." A love story between Dojun, a man who wants to protect, and Suin, a woman who wants to be protected.