Although she does not have the confidence to make herself look cute wearing "in style" clothing and great hairstyles, she enjoys creating cute hair styles for her little sister. In her new high school, it is a custom to have the top scoring student make the entrance speech, however, on the day of the entrance ceremony, she is beaten ironically by a male student named "Kyouta Tsubaki" who has very long hair for a boy! Even though he is the smartest, he is also the rudest guy she's ever met - and she unfortunately ends up sitting next to him in class. This leads to her chopping off a good chunk of his hair because of the rude things he says to her. He demands for her to pay the price, which is either 50,000 yen, or her body. Misunderstanding what he says, she does something totally different from what he expects.

    So that she can attend high school, Benio is assigned the ninja Tamaki as a bodyguard, but he turns out to be quite the player. It’s not always easy for a strong-willed rich girl and a smart-alecky ninja to get along in this romantic comedy about a pure young lady and her smoking hot knight.

    When she dumps the guy immediately after, she pisses off his handsome best friend Ji Hu and from that point on, the two are constantly going at each other’s throats like cats and dogs. When Jae Yoo finally accomplishes her dream of entering the “boarding house of hunks,” she thinks that nothing could go wrong. An amazing house, a kind landlady, and even a cute guy who seems to be interested in her… What’s this?! Ji Hu is the landlady’s son?! And how is it that he knows about Jae Yoo’s most embarrassing moment in life? What kind of life will the two lead under the same roof? Will they be able to live together at all?!