Your mother married a rich man and you had to leave your hometown and move to your rich stepfather's house. Your stepbrother turns out to be the arrogant, daring and narcissistic Yeonjun. Yeonjun plays the role of a good guy in front of his father, but in reality he is a disaster. No party goes by without Yeonjun. Yeonjun participates in illegal racing and fighting and sleeps with everyone.

You both don't get along and quarrel constantly. You’re infuriated by Yeonjun and his stupid grin.