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She was on a recent episode of JTBC's 'Hyori's Bed and Breakfast 2'. As a part-timer, YoonA was shown meeting Lee Hyori and her husband, Lee Sang Soon for the first time. 

YoonA said, "I was thinking of a new dish I could make and waffles came to mind. That's why I decided to buy a waffle machine." The following day, YoonA put her skills to the test when she made waffles for the loving couple. The couple's response was enthusiastic, commenting "It tastes like it was sold outside [in a store]. It's delicious!" 

Shortly after the broadcast of the episode, waffle machines began to soar on the hit list for popular Korean search engines such as Naver and Daum. According to the production team, the waffle iron is not a PPL product. However, YoonA was still put in the spotlight for making such a wonderful dish. 

One Twitter user wrote in the early morning of February 5th, "The waffle iron is already out of stock on Coupang and the broadcast isn't even over yet." In fact, as of February 5th at 1:30 PM, the same waffle machine that YoonA used is temporarily out of stock at the online shopping mall known as 'Coupang'. 

The long, padded coat that YoonA was wearing also caught the attention of viewers. YoonA, Lee Hyori, and Lee Sang Soon went to a tangerine orchard to make fresh juice to give to people. Lee Hyori commented on the pure coloration of YoonA's coat, confirming that it is almost blindingly white. The product is known online as "YoonA Long Padding" and costs around $300. Unsurprisingly, the white variation of the coat that YoonA wore during the broadcast is sold out. 

The cropped tee that YoonA and Lee Hyori wore during the show has also been confirmed to be out of stock. YoonA is clearly a trendsetter no matter what she does!