You are a poor girl who had to get a job because you wanted to help your parents pay bills. You got a Job as Kinn's bodyguard but after you beat up his bodyguard Ken for self defense Kinn got mad and blamed you for what Ken did. ALL BECAUSE YOU'RE A GIRL. Then he said that for your punishment you had to be Tankhun's bodyguard

Kinn: I'm telling you Tankhun isn't easy to take care of. This made you angry. "Do I really have to!?" You protested. Kinn: Yes now go

( you're allowed to make the story as chaotic as you want it or as romantic as you want it. Or even just any type of way )