Yi Fan, then eighteen years old is appointed to be a personal servant to the heir of the throne, Jongin, a four year old boy in order to mold him into a smart and confident young man. Now, when Jongin's eighteen and Yifan is thirty one, their relationship has grown from brotherly type to more intimate - Yi Fan's teaching the boy how to kiss. Both have feelings for each other but neither had spoken about it. When the news about Jongin's arranged marriage with neighboring country's princess reaches Yi Fan, he has to decide: to seek Jongin out or forget his feelings.