On September 25, ZE:A's Twitter uploaded the above picture featuring Seo Kang Jun, Nam Ji Hyun, and Hyungsik with the caption: "In a little bit at 11:10 PM, team 'What's With This Family' will appear on 'Happy Together'!  Everyone stay tuned for Hyungsik, who is loved by his sunbaes, and his special secret."

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True to the caption, the KBS 2TV show 'Happy Together 3' later aired featuring the 'What's With This Family' cast as guests. In their drama, Hyungsik's character is involved in a love triangle with Seo Kang Jun and Nam Ji Hyun. One surprising revelation Hyungsik made during this 'Happy Together' episode was that he would get jealous whenever he saw Seo Kang Jun and Nam Ji Hyun together.

When MC Park Mi Sun asked, "Since you are in a love triangle, do you ever actually get jealous?" Hyungsik remarked honestly, "Of course it's not genuine, but when Seo Kang Jun and Nam Ji Hyun come in together, I ask, 'Why are you two coming together?' for no reason. I get jealous."

Seo Kang Jun on the other hand, expressed, "I don't think I've ever gotten jealous." He further explained that his character was the one creating trouble, saying, "My character is the one who originally cuts in between the other two. There's no jealousy."  

On Hyungsik's love life and preferences, the MCs additionally asked Hyungsik, "Would you date someone who is a couple years your senior?"

Hyungsik responded, "If I have feelings for a woman, then age doesn't matter."