Singer Seo In Young looks chic and innocent with her younger sister.

On December 27th, Seo In Young uploaded a photo of herself next to her younger sister. She posted it to Instagram with the words "my sister."

In the photo, Seo In Young and her blood-related younger sister Seo Hae Young are posing affectionately with one another. While Seo In Young looks chic, Seo Hae Young looks more innocent with her long, straight hair.

Fans who saw this photo of Seo In Young with her younger sister commented, "They're household is genetically gifted," "Her younger sister looks better," and "They're both so pretty."