Actors Jung Hae-in and Ha-young appeared on the 323rd episode of the KBS2 variety show 'Rooftop Room Problem Children,' filling Friday night with laughter. Along with the 'Rooftoppers' members Song Eun-i, Kim Sook, Kim Jong-kook, Hong Jin-kyung, Yang Se-chan, and Joo Woo-jae, the two engaged in quiz-solving and conversation, showcasing their diverse charms and sharing honest stories.

From their first meeting, Jung Hae-in and Ha-young displayed natural chemistry by mentioning each other's laughing points. Ha-young said that Jung Hae-in has a low laughter threshold, and Jung Hae-in responded that Ha-young is the type to laugh out loud. Yang Se-chan joked that Jung Hae-in is 'the type comedians should be careful of,' turning the set into a sea of laughter.

As Jung Hae-in's unexpected charms were revealed one after another, Joo Woo-jae repeatedly expressed jealousy. When Jung Hae-in honestly shared anecdotes such as gifting clothes to filming staff, presenting a car to his parents out of filial piety, and admitting that he now likes being told he looks young, Joo Woo-jae drew laughter by saying, 'A filial son too? If you're human, you have to be lacking in a few things.'

His secrets to self-care were also revealed. Jung Hae-in shared his dietary philosophy, saying that if he eats hamburgers and french fries, his body shows changes immediately, and introduced his habit of eating protein first and refraining from late-night snacks. Joo Woo-jae joked, 'That's all Jong-kook hyung's routine,' and Kim Jong-kook smiled with satisfaction.

Their friendships with the Rooftop members also drew attention. Song Eun-i revealed that she has been following Jung Hae-in since his rookie days and even hosted his fan meetings, and Jung Hae-in said they are close enough to exchange greetings on every holiday. Kim Jong-kook added, 'Isn't it like a grandchild taking care of a grandmother?' bringing more laughter. Hong Jin-kyung said she contacts Jung Hae-in from time to time, and Jung Hae-in revealed that Hong Jin-kyung had brewed medicinal alcohol for him. The members playfully suspected Hong Jin-kyung's true intentions, further livening up the atmosphere.

Jung Hae-in's unexpected physicality also became a hot topic. Ha-young praised his physique, saying it was so solid that it would hurt if you bumped into him, and Kim Jong-kook complimented his forearms. Jung Hae-in named his forearms as his favorite body part and successfully completed the 'forearm challenge' by tearing a cup holder with his forearm strength on the spot. Kim Sook also took on the challenge and succeeded, but Joo Woo-jae failed, delivering another round of laughter.

The life stories of the two actors were also shared. Jung Hae-in revealed that he had been preparing for a science and engineering track before starting acting at age 26 through a street casting, and shared his experience of overcoming his father's opposition. Ha-young said she majored in art and even attended a graduate school in New York, but was drawn to the charm of acting and decided to take on the challenge.

It was also revealed that Ha-young comes from a prestigious family of doctors. Her great-grandfather was a doctor who opened the first Western-style hospital in Hanyang, and the fact that her entire family are doctors surprised the MCs. Ha-young shared that she received medical advice from her family during the filming of the drama 'Severe Trauma Center.'

In the latter half of the broadcast, their extraordinary eating habits were also revealed. Jung Hae-in stated that he eats meat by the muscle and up to four hamburgers, while Ha-young said she eats three packs of ramen and four to five servings of meat, astonishing everyone. During an impromptu ideal type tournament, Ha-young said she looks at personality over appearance and revealed that her actual ideal type is director Jang Hang-jun, bringing laughter to the set.

In the quiz corner, various questions were presented, including the function of 19th-century British police hats, the miraculous surgical operation at Jejungwon, the ingredient for washing lettuce in the 'Sijeonseo,' and the emotional affluence of the Gen Z generation, with related stories following each topic.

After the broadcast, viewers poured out positive reactions on social networking services regarding the pure charms and cheerful atmosphere of Jung Hae-in and Ha-young. 'Rooftop Room Problem Children' airs every Friday at 10:10 p.m. on KBS2.