Kwon Yuri is a struggling actress who has been juggling an almost non-existent acting career with her full time college degree and a weekend job at Dongdaemun’s fashion street.

Her half-sister, Seo Juhyun, otherwise known as Seohyun, is a brilliant young lady who has skipped a few grades to be in the same class as Yuri. Yuri and Seohyun love each other a lot, even though they may not share the same father.

While working on a commercial, Yuri meets Choi Siwon, an aspiring television series producer who is slowly working his way through the ranks. Yuri and Siwon become good friends, and start to spend more time together, which leads to Seohyun’s jealousy.

As Seohyun grow to understand Siwon better, she is introduced to his best friend since childhood, an arrogant playboy by the name of Cho Kyuhyun. Seohyun and Kyuhyun start to grow closer, as the two sisters grow apart…