Older Female Younger Male Romance Drama

I am looking for a particular drama in which the brilliant female lead is forced to tutor the rebellious son of some police official? The male lead is rebellious, hates older brother and loves his childhood crush and becomes a police official in the end. The age difference is about two years. I remember the full plot but not the name of the drama. It will be great help if i can find it . I have watched it earlier but cannot remember the name.