As child actress Kim Yoo Jung appeared as a guest on KBS 2TV's 'Happy Together 3' on December 4, the show revealed a video message from her older sister, Kim Yeon Jung, that they had prepared beforehand.  As this episode centered on eating, Kim Yeon Jung talked about her sister's appetite and diets.

With an appearance as strikingly beautiful as that of her sister, Kim Yeon Jung said in the video, "My younger sibling comes out really cute and adorable on TV.  However, at home, she eats and poops well."

When asked whether she fights with Kim Yoo Jung, Yeon Jung replied, "If my mother makes and packs food, seeing as there are three siblings, our oppa needs to eat it, I need to eat it, and our youngest sibling needs to eat it, but when she comes back from school, she'd have eaten it all, so I remember we fought.  We fight over food a lot.  Kim Yoo Jung is very gluttonous."

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She was then asked about whether she ever pitied her younger sister.  Kim Yeon Jung said, "These days, Yoo Jung is dieting, so she can't eat the school lunch.  She packs cucumbers and tomatoes to eat.  I found that really sad."

She concluded with a message directed to her sister, "These days, you must be having a very hard time, so I'm sorry I can't take in your complaints.  If you're having a hard time about something, make sure to tell me.  I hope you will become a good actress."