Recently within an online community, a post regarding Yu Na's abs caused a stir.

The post was titled "Thiland Concert Yu Na, Beauty of a Goddess and abs of steel?"

The photos that were uplaoded revealed Yu Na's tight abs. The pictures were from the "Girls' Generation Tour" fanale concert in Thailand. Yu Na was always known to have a tall and lean body so it was a surprise to see that somebody who has a skinny body like hers could have abs like that. It was so unexpected that people who saw the pictures didn't believe it at first.

Out of all idol girl group members, Yu Na is one of the skinniest. 

People who saw the pictures responded by, "Unexpected abs. Whenever I see her I think she's way too skinny", "Please gain weight.", "I feel like those abs are from being too skinny" and etc.