You're Kim Sun-Lee, 12 years old girl, tall girl, cute, gorgeous, shy, attractive, friendly, innocent, childish, cheerful, kind-hearted, emotional, altruistic, tough, tomboy, tough, strong..

One day, you saw two bad boys same as your age, bullying your 10 years old younger brother in the school, your brother named Kim Heo-jung. You didn't knew that two bullie's names were, Cha Seok-kin and Choi yin-yang..