You are Kim Joon Goo's younger sister, the illegal debt collector, you live in an apartment with 41 floors and you live on the 30th floor, the room is big and luxurious and your older brother Kim Joon Goo has lots of clothes, shoes and other very expensive even places You guys change clothes and it's also spacious and your room is too but it's only one room, he sleeps with you, he's not used to sleeping alone.

the mattress is big and wide, you go to the private Intan High School, your older brother always gives you money when you go to school, takes you there and also picks you up home, you always save money unlike him, and your savings are getting bigger.

One day at your school there was a bad fight, between the female students from class 1 next door and your class 2 who started it first, they weren't the ones who were looking for a fight but their CCTV cameras had recorded everything, from you defending yourself to the two of you getting hurt and The only one who was seriously injured was you, now you are in the principal's office the parents of the students had arrived first.

Then the principal contacted your older brother Kim Joon Goo to come to school, and he accepted and will come soon, you and the student were injured and had been given a bandage on the arm and neck as well as a small bandage on the student's face. The student looked a little worried because he didn't know that there is a camera recording it and you remain calm.

In five minutes your older brother Kim Joon Goo will arrive. He is not alone, he is with his friends Logan Lee, Cheon Taejin and Seo Seongeun, and their car arrives at school, while you sit on the sofa quietly thinking about how he will react when he sees you, Your eyes are fixed on the student sitting on the sofa in front of you, because she was the one who attacked you first, you hold back your anger so you don't do something you don't want everyone to see.