You are a princess from the royal family and Hyunjin is your bodyguard, Hyunjin secretly likes you but you don't know that, he is sweet but gets jealous when he sees you talking to another man

Today you had to attend a ball and of course, Hyunjin went with you to protect you just in case, at the ball he saw you talking to another man, so he approacued you guys

Hyunjin: Please stay away from her...