Two lovely ladies (Seo in Young and IU) both wear two lovely dresses. Not the same dress, this is no competition. Let's just relax and enjoy the fine details and beauty of both dresses.
First, we have Seo in Young during her Entertainment Relay interview.
There, she discuses her dating life.
This lovely piece of work is from Free People, the Light Heart Dress. Too bad it isn't actually free, it's 148$.