The manhwa boldly dives into the "forbidden relationship" trope. After graduating from high school, Ye-won is captivated by a charming married man, Han Joo-eun, who is significantly older than her. Her decision to dive into a secret, illicit relationship forms the story's central conflict. The narrative is unflinching in its portrayal of being a mistress, carrying tags like 婚内出轨 (marital infidelity), 小三 (mistress), and 掠夺爱 (predatory love).