Kim Byung-hyun and Shin Hyun-joon brought laughter as they performed as "Dumb and Dumber Nolbuz."

On the 28th (Monday) episode of KBS2's entertainment show "Study and Play," a total of seven family teams participated in a quiz, featuring intergenerational MCs Kang Ho-dong, Kim Ho-young, and Lee Soo-yeon, starting with Kim Jung-tae and his son Kim Si-hyeon (6th grade), followed by Kahi and her sons Yang Noah (3rd grade) & Yang Si-on (1st grade), Yang Eun-ji and her daughter Lee Ji-eum (2nd grade), Kim Byung-hyun and his sons Kim Tae-yoon (5th grade) & Kim Joo-sung (2nd grade), Shin Hyun-joon and his son Shin Ye-jun (1st grade), Lee Ji-hoon and his sons Lee Ho-jun (4th grade) & Lee Seo-jun (1st grade), and finally Lee Yoo-jun and his son Lee Joong-hyeon (2nd grade).

KBS2’s ‘Study and Play’ brought viewers another round of hearty laughs as the 'Dumb and Dumber Nolbu' duo, Shin Hyun-joon and Kim Byung-hyun, continued to blunder through elementary school problems in Monday's episode.

The seven family teams—comprising intergenerational MCs Kang Ho-dong, Kim Ho-young, and Lee Soo-yeon—who kicked off the new semester with a fresh start, included Kim Jung-tae and his son Si-hyeon (6th grade), Kahi and her sons Noah (3rd grade) & Si-on (1st grade), Yang Eun-ji and her daughter Ji-eum (2nd grade), Kim Byung-hyun and his sons Tae-yoon (5th grade) & Joo-sung (2nd grade), Shin Hyun-joon and his son Ye-jun (1st grade), Lee Ji-hoon and his sons Ho-jun (4th grade) & Seo-jun (1st grade), and Lee Yoo-jun and his son Joong-hyeon (2nd grade).

The episode, titled the "Spring Picnic Special," promised a chance for correct-answer kids to draw prizes from a "lottery box," receiving explosive responses from the start. The first question posed was a 6th-grade math problem asking to "find the volume of Kim Jeong-ho's pencil case, which drew the Grand Map of Korea (Daedongyeojido)." Among them, Kim Byung-hyun unexpectedly exclaimed, "Did he make pencil cases too?" showcasing his cluelessness and causing laughter.

Furthermore, as the relay quiz, a highlight of "Study and Play," unfolded, the two's "Dumb and Dumber" banter continued to shine. The question was to identify the names of historical figures from photos covered in the 4th-grade curriculum within three seconds. If answered correctly, snacks would be provided. In response, Kim Byung-hyun's eldest son Tae-yoon said, "Dad! You have to get this right," firmly urging his father.

However, due to Hyun-joon's poor performance, Ye-jun, feeling despondent, cast a tearful glance at his father. When Kahi answered "Yu Gwan-sun" and Kim Jung-tae answered "Yi Sun-sin," both Byung-hyun and Hyun-joon, seemingly in agreement, chimed in unison, saying, "Everyone who knows is here," which elicited more laughter.

At that moment, as a cloud of gloom shadowed Ye-jun's face, Byung-hyun's second son Joo-sung encouraged him, saying, "No, An Jung-geun might come up." But Ye-jun, trapped in a hell of distrust towards his father, innocently remarked, "But our dad doesn't know An Jung-geun. I'm serious," spreading unfounded rumors. This led to Byung-hyun's two sons expressing shock, saying, "Uncle Hyun-joon doesn't know An Jung-geun," creating a hilarious moment of innocent banter among the children just as amusing as the fathers.

On that day, Hyun-joon drew attention by boasting an oddly strong bond with "Yi Sun-sin." Due to the answer being "three consecutive Yi Sun-sin" in a previous appearance, he was assigned a question again about identifying Yi Sun-sin's face. Additionally, a question asking about the figure on the 100 won coin also had Yi Sun-sin as the answer. In response, he declared, "I feel like Yi Sun-sin is almost like my other half," creating the "Yi Sun-sin Hyun-joon worldview," which had viewers laughing out loud.

Moreover, the laughter continued with unique quizzes and amusing wrong answers. During the special quiz on after-school activities hosted by MC Soo-yeon, there was a question asking which singer's song was being described through K-pop choreography. The correct answer was New Jeans's "Super Shy," but the responses varied wildly from Kahi's "Super Star" and Yang Eun-ji's "Hot Baby" to Kim Byung-hyun's "Super Psy" and Lee Yoo-jun's "Super Woman."

In another surprise segment where children participated, a question asked them to guess who a person was from a photo, and when Hyun-joon's childhood photo appeared, it bore an astonishing resemblance to Ye-jun.

Meanwhile, after seeing Kang Ho-dong's middle school graduation photo, Ye-jun claimed, "Isn't that Tae-yoon's older brother?" asserting that Byung-hyun's eldest son resembled Kang Ho-dong. To this, Tae-yoon responded, "Ye-jun, I didn't see you that way," adding to the humor.

Kang Ho-dong reflected on his striking appearance, humorously saying,