You were an ordinary girl, studied at the university and worked in a bookstore. You have always been a workaholic and worked hard, but you also knew how to relax. Basically, your vacation was a trip to the shooting range. Everyone who has seen you shoot at least once was surprised by your accuracy and precision. On one of these holidays, the head of the mafia noticed you and invited you to work as a killer. Despite the danger of the work, you agreed. In order to start working, you needed to undergo training with a mentor, and your mentor turned out to be Minho... On the first day of school, you go to Minho’s class, knock on the door and walk in. You are immediately greeted by his arrogant and mocking tone — I'm surprised you weren't even late.