IU's Candid Dating Confession on Yoo In-na's Show Has Her Best Friend Seriously Worried

IU has never been one to dodge an honest question. But even by her standards, the confession she made on Yoo In-na's YouTube show on April 29 landed with unusual clarity — and her best friend's response immediately afterward made the entire moment go viral.

The episode of Yoo In Radio, which also featured Byeon Woo-seok, brought together the two lead stars of the currently airing MBC drama 21st Century Grand Prince's Wife for a candid conversation that quickly stopped being about the show entirely.

The Balance Game That Revealed Everything

At the heart of the episode's most talked-about moment was a balance game — a format designed to surface personality by forcing binary choices. The question: which type of partner would be more exhausting to date? Option one, a completely go-with-the-flow partner who agrees to everything without offering opinions. Option two, a type-A planner who follows a strict schedule and expects the same in return.

Byeon Woo-seok and IU chose opposite sides, setting up the conversation that followed. IU said she would find an overly passive partner more draining — she prefers someone with a clear plan, even if it means accommodating a demanding schedule. "A partner who just goes along with everything makes me feel my energy draining away," she said. "But if someone has a clear plan, I can match that."

What happened next was the moment fans have been replaying. Yoo In-na, who has known IU for years and holds nothing back, looked at her best friend and said, essentially: you have no idea how inaccurate that self-assessment is.

"Don't make me laugh," Yoo In-na told her, with the directness of someone who has earned the right. "IU goes along with whatever her partner wants. She accommodates everything, keeps no signal that she's running on empty, and then ends up bedridden and going to the hospital."

Yoo In-na's warning was delivered with the tone of someone who has watched this pattern play out more than once. "Choose the go-with-the-flow type," she said. "Don't get sick."

IU, to her credit, sat with the feedback rather than deflecting it. "Actually, hearing it like that — maybe I am more the go-with-the-flow type," she admitted, to laughter from everyone present.

Byeon Woo-seok's Mirror Moment

If IU's moment was the emotional core of the episode, Byeon Woo-seok provided the comic relief — and somehow also the most quotable lines of the night.

Yoo In-na, in her role as the perpetually probing host, asked him whether looking in a mirror ever breaks his confidence. Byeon Woo-seok answered with perfect deadpan timing: "I look in mirrors often. I always crumble a little."

Then, without missing a beat, he clarified his thinking: "But on set, there are lights and the crew working behind me. So I don't really think about it there."

Before the conversation could move on, IU stepped in with a full rebuttal. Having worked alongside Byeon Woo-seok extensively during the production of 21st Century Grand Prince's Wife, she said, she has seen him in all conditions — on set, between takes, during breaks with no styling whatsoever. Her conclusion was unequivocal: "Woo-seok has never crumbled from looking in a mirror, and he never will."

She went further, noting that she had co-starred in a photo shoot with him and watched him navigate modeling-style setups with apparent ease. "Whatever he does, it's always a perfect shot," she said. "He did modeling for a long time, and you can genuinely tell the difference."

Byeon Woo-seok returned the compliment in his own way, describing IU as someone who has an almost inexhaustible range of facial expressions — "about 75,000," he estimated, which prompted Yoo In-na to confirm the number with something approaching reverence.

The Chemistry Behind the Drama

21st Century Grand Prince's Wife, the MBC drama that brought IU and Byeon Woo-seok together, has been one of the more discussed ongoing dramas of the season. The show is set in a version of modern-day Korea that operates as a constitutional monarchy, centering on a wealthy woman with commoner status and a prince who, despite his title, has been denied everything he was supposed to inherit. Their story is framed as a romance about defying fate — two people who have no obvious reason to fall for each other, and every reason to keep their distance.

Off-screen, the chemistry has apparently been just as easy to find. IU described the filming environment as uniformly enjoyable. "We play together every day," she said. "It has been really fun the whole way through."

Yoo In-na, who has been following the production closely enough to have strong opinions about its cast dynamics, described their on-set energy as kindergarten chemistry — which she meant as a compliment. Two people with completely unguarded enthusiasm, she said, who seem to find genuine amusement in everything they do together.

IU, Yoo In-na, and a Friendship Built on Honesty

The IU and Yoo In-na dynamic has been a feature of Korean entertainment coverage for years, largely because it reads as one of the more authentic celebrity friendships in the industry. The two women have known each other long enough that their interactions carry the specific texture of people who no longer need to soften their opinions for social comfort.

That quality — the willingness to tell someone the truth with warmth rather than judgment — was exactly what made the exchange about IU's dating style so memorable. Yoo In-na's warning was not unkind. It was delivered with the precise energy of someone who cares enough to push back, and IU's response showed that she received it the same way.

Whether viewers came for the drama news, the IU content, or the Byeon Woo-seok appreciation, most left the episode having gotten considerably more than they came for. 21st Century Grand Prince's Wife continues to air on MBC, and based on this episode's reception, the off-screen conversation between its two leads may end up being just as compelling as the drama itself.

What This Episode Got Right

There is a version of this kind of variety content that feels obligatory — the promotional circuit appearance where drama casts show up, say complimentary things about each other, and leave. This episode was not that.

Part of what made it work was Yoo In-na's hosting style, which operates on the premise that no question is too personal if it's asked with genuine curiosity and affection. Her willingness to hold up a mirror to IU — literally, in the sense of pointing out something her friend cannot see about herself — gave the episode a texture that pure interview formats rarely achieve.

Byeon Woo-seok, for his part, played the episode smartly, knowing when to lean into self-deprecation and when to pivot to sincerity. His instinct toward humor is clearly well-developed, but the episode also showed that he understands when a moment calls for something quieter.

IU remains, as she has for years, one of the most naturally compelling presences in Korean entertainment. She has a quality of genuine engagement — a sense that whatever she is doing in the moment, she is actually doing it and not running a parallel performance for the camera. That quality came through clearly here, and it is exactly the kind of thing that makes casual content like this stick in the memory long after the promotional cycle ends.

Fans of the drama now have an additional reason to look forward to the remaining episodes. If the chemistry between IU and Byeon Woo-seok off-screen is this easy and genuine, what they bring to the more emotionally demanding scenes of 21st Century Grand Prince's Wife should be something worth watching.