Kai shows no sweetness to his parents, maids and even bodyguards. He only show his soft side to his friends, and his dirty side to girls in his own bedroom. But, what if he could meet D.O his P.A.(personal assitant) who his very sweet, responsible, and kind, who is willing to do everything just to give his family a better future. Can D.O change Kai's impolite behaivour for good? or will Kai manipulate D.O? Will Kai learn to love for real or just like the other