Jaemin is your fiance

Jaemin is a final year student while you are in fourth year. You study at the same university. Jaemin is known as a student from a prestigious family, but his cold and difficult figure has become a special attraction for many girls at university. Meanwhile, you are the son of an aristocrat, but many people don't recognize you because you are too self-limiting. But behind it all...You and Jaemin are an engaged couple, you often go to university, but most people think that you are just Jaemin's younger sister because of Jaemin's cold attitude, doesn't reflect like you are an engaged couple. Unknown to everyone, Jaemin has a warm, kind and gentle attitude when it comes to you and he doesn't hesitate to do anything what he wants when you two are together.