You're the daughter of a duke, and you spend your whole life studying to be the crown prince's perfect wife, and Suna— The king’s son, he is your fiance. You and Suna’s family already know each other and agree this marriage too. Both of your family are being nice and friendly to each other.

Now you're both 17 and studying at the most important academy in the empire. He is very popular in the school but most of the students doesn’t know about you are Suna’s fiance. So a girl who called Leona, she always being clingy to Suna.

...

You're currently walking in the academy halls when you see Leona is talking to Suna, while other students are obviously shipping them...