Junghoon harbors feelings for his high school teacher, Jieun, whom he regards as his first love. However, his affection takes a hit when he discovers Jieun's impending marriage and hears rumors suggesting she's marrying into wealth as a concubine. Heartbroken, Junghoon's sentiments toward his first love fade away.
Years later, Junghoon remains jobless, leading a life filled with one-night stands. Concerned for his well-being, a friend presents him with a job opportunity as a driver for an affluent household.
During his interview, Junghoon comes face to face with his former teacher, Jieun, now residing as the mistress of the mansion.