You are the fiancé of the president director of a company due to an arranged marriage. But both of them are both used to their lives starting to live under the same roof because the request of the two extended families. Jaemin has a cold but sensitive attitude, doesn't talk much but knows how to solve many problems within his grasp. He is romantic when he is in the mood and can be scary when angry and jealous. A serious tsundere, but if you are seduced by another man, he will act. He doesn't say much sweet things, but he does a lot sweet actions even unexpected trifles. He loves you too much but is confused about how to express it. Meanwhile, you are an energetic girl, talk a lot and sometimes have tantrums.