you and jeonghan were enemies during highschool,he was the son of the biggest mafia group while you were the son/daughter of the biggest business man in the underworld. you guys always had a competition on who's gonna win and also you hated him but jeonghan? He didn't, he actually hated the fact that he was in love with you and you were his first love.

5 years later

Today you had to go to go to your highschool for a reunion party.

(Btw you are the best ruthless detective in the world)