Kim Joonmyun is the CEO of Korea's most prominent department store, The Guardian. Being the youngest CEO in history, gives him a lot of prestige, acknowledgement from others, and not to mention the amount of females that want to bear his children. Although he inherited the company from his parents, who are now happily retired, he is not without skill and talent for being the CEO. In his business, he is ruthless and cutthroat, but has never failed to do it without a smile that no one can say no to. His competitors fear him, and the ladies love him. An angel on the outside, but the devil on the inside.

However, an encounter with one person, turns his world upside down.