Kim Heechul Discovers He Is the Same Age as an Idol Mom And His Reaction Is Everything

When Kim Heechul sat down on JTBC Knowing Brothers on March 14, he probably did not expect to walk away as the honorary father of an entire generation of K-pop idols. But after a shocking age revelation involving one of the show guest groups, that is exactly what happened.

The episode featured two rising girl groups, Hearts2Hearts and KiKi, appearing together for a 5th Generation Girl Group Battle. Both groups, filled with fresh-faced idols born well into the 2000s, brought an unmistakable energy to the classroom setting. But it was a single comment about birthdates that stole the spotlight.

When Heechul Became a Dad

Hearts2Hearts member Aena mother came up in conversation, and it was quickly revealed that she was born in 1983 — the same birth year as Kim Heechul himself, making them both 42 years old. The realization hit the cast like a wave. Cast members wasted no time suggesting that Heechul could simply take on the role of Aena dad, and to the delight of everyone watching, Heechul played along without missing a beat. "Call me dad from now on," he reportedly told the group members with his signature deadpan charm. The moment was quintessential Heechul — self-aware, quick-witted, and entirely unfazed by the generational gap that had just been made very public.

Hearts2Hearts and KiKi Shine

Beyond the age humor, both groups gave viewers plenty to appreciate. Hearts2Hearts member Yuhah discovered an unexpected connection with Heechul when it turned out they share the same hometown of Wonju — and that her uncle had actually been in Heechul class during their school years, tightening the hometown bond even further.

Newer group KiKi took a moment to explain the story behind their name. Derived from a laughing sound, the name reflects the group commitment to bringing joy and humor to their fans. When the cast questioned whether a laughing onomatopoeia could translate internationally, the members pushed back confidently, describing it as universal across English-speaking countries.

KiKi internal structure also drew curious questions from the cast. In a setup that defied typical idol group hierarchies, second member Jiyu serves as the group leader while the eldest member Isol holds the title of official oldest — following a tradition established by their agency. Jiyu added another impressive detail: she studied baduk, also known as Korean chess, for seven years and achieved a first-dan ranking, even finishing as runner-up in a regional tournament.

A Candid Behind-the-Scenes Reveal

Hearts2Hearts Ian also offered a candid moment when she shared that she had been cut from a previous taping of You Quiz on the Block — despite having successfully won prize money during filming itself. The disclosure drew laughter and sympathy from the cast in equal measure, turning what could have been an awkward admission into one of the episode warmer moments.

The episode as a whole served as an entertaining showcase of just how vibrant the 5th generation idol scene has become, with groups like Hearts2Hearts and KiKi bringing distinct personalities that go well beyond their debut tracks. And for Kim Heechul, it added yet another memorable chapter to his long legacy as one of K-pop most irrepressibly entertaining figures.