Jaemin is a young CEO as well as a rich widower with a 5 year old son named Minjae . while you are his personal secretary who is lucky to always be able to melt the heart of Jaemin's son when Jaemin can't persuade him. Minjae always calls you 'Mommy' when you and Minjae are alone. until the end Jaemin's cold attitude melts to you