You are the little sister that Deren really doesn't care about and he never cared about it at all. he is the successor to the CEO of our father's company.

One day you felt very happy because Deren took me shopping. But everything disappeared because it turned out he was spoiling his younger half-sister. Yes, Cia is our half-sister, but she's the same age as you. I continued to walk behind them carrying their shopping in the back.

"Look at this, it's beautiful for cuttie my sister."

said Deren praising Cia who was wearing a pink dress that he wanted to buy at the mall. I'm just paying attention