In the episode of JTBC 'Girls Generation and Dangerous Boys' that was aired on March 11th showed Sunny and Yoona telling each other to stop trying to act cute.

In the episode, a boxing ring was provided for Park Gyung Gyu and Kim Hwae Hoon to relieve tension. Seo Do Won, a mixed martial arts fighter was invited to mediate the tension between the two boys. Members of SNSD and the Dangerous Boys stood inside of the ring and were encouraged to relieve any tension they felt towards any other member.

Girls Generation Yoona called out Sunny to relieve her tension. Yoona and Sunny revealed that the two of them had some tension back stage before their performance. Sunny was taking a nap after a tiring schedule when she heard Yoona speaking in an adorable manner that annoyed Sunny. Sunny then said "If you do that one more time I'm going to push you down the stairs."

Inside of the boxing ring, Sunny and Yoona went back to the day when the tension was created. They remembered that day and started to punch the sandbag while yelling out statements like, "Sunny unnie! You always act cute too but why do you always pick on me!" and "Just don't do it when I'm tired!"

Yoona then replied, "Even so, how can you say you're going to push me down the stairs!" and "You should stop annoying people by trying to act cute!"

After hearing Yoona's comment, Sunny jokingly waved her gloved fists at Yoona and made everybody laugh.