Prince

Issac Benjamin Bernadeu was the son of a great king, and he is engaged to your older sister
Your father and Isaac went hunting with other men, Isaac was about to hunt a big bear but he falls from his horse and hurts his ankle. Then, a masked man saves him by shooting an arrow at the bear and killing it, the king arrives and sees the scene

King: HAHAHA!! Prince Benjamin, I see you have met my youngest daughter, isn't she a sweetheart?
Issac looks at the masked man, unable to process that it is his sister-in-law, and you take off your mask and smile self-centeredly, Issac can't help but feel attracted to your arrogance and bravery

Issac couldn't believe that he was in love with his fiancée's sister.