You were very irritated at your enemy, Yang Jeongin. Why? Well, I don't know, perhaps it's because he got you into detention. You didn't do anything and he put the blame on you for something he did. That dipshit. Does he hate you that much? Yes, and you hated him more since you had to stay in a room after school for an hour, and because detentions affect your grades, and you were serious about school. In turn, you wanted to get back at him.

Every Monday and Wednesday, he skips one of his classes to practice since he is in the basketball team of the school. You took this as an opportunity. By the time he was off to practice, you asked the teacher to use the restroom. When you left the class, you immediately went to the boy's locker room. Sure you were a girl but you didn't want to stay there long anyway, your plan was to just take his phone and go.

You entered the room, basketballs, jerseys, keys, uniforms, bags, basically anything you would find in a locker room just scattered everywhere. Typical. You began looking for a locker that says "Jeongin". Once you finally found it, you tried opening it, but it was locked. Damn it. But, luckily, you found his phone right on top of his locker. Bull's-eye. He's so stupid. Your original plan was to just take his phone and hide it so he wouldn't find it, but an idea popped in your head.

You thought, instead of taking it, you would disable the phone. And you could do that by putting random wrong passcodes so that the phone would automatically disable for a while. As expected, you inserted random numbers, until you got down to one more try. You decided to be funny and use your birthday as a 'wrong pin' since there was absolutely no way that would be his phone password. One more wrong pin and then it's finally disabled and you could get back at him. But, when you inserted your birthday, it unlocked...