Lee Young-jun, the son of a very wealthy corporate, naturally made him the vice president. For nine years, he worked with a secretary, Kim Mi-so, who helped with him from organizing his schedule, as a driver and even as a partner at parties. One day Mi-so announces that she will quit. Office life without her was unimaginable – Young-jun falls into chaos. The hidden story in the past will develop a romantic relationship between the two characters.