Curious About ’21st Century Grand Lady’? Discover Yoon Byung-hee’s Role and On-Set Chemistry with IU!
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[Sports Seoul | Reporter Choi Seung-seop] Actor Yoon Byung-hee has shared a warm behind-the-scenes moment that stands in stark contrast to the tense on-screen dynamic.
On the 12th, Yoon posted a photo with IU on her social media, captioned, “CEO Seong Hee-ju, I’m actually a fan.”
In the released images, the two stand side by side on the drama set, flashing V signs and smiling brightly.

In the currently airing MBC Friday–Saturday drama “21st Century Grand Lady,” Yoon makes a special appearance as the head of PR for Castle Beauty, the company run by lead character Seong Hee-ju (IU). Onscreen, their relationship plays out as a strict boss-and-subordinate dynamic: Seong Hee-ju’s sharp rebukes leave Yoon visibly rattled — a contrast that resonated with viewers.
In episode 1, which aired on the 10th, Yoon captured the everyday frustrations of office life as she nervously navigated Seong Hee-ju’s pressure following poor product sales, even trembling while taking orders.
In episode 2, broadcast on the 11th, Yoon carried out a covert assignment to gather information on Prince Ian (Byun Woo-seok) and, delighted, asked, “Did I get on the CEO’s good side?” — a beat that injected fresh energy into the story.
Set in an alternate South Korea operating under a constitutional monarchy, “21st Century Grand Lady” follows the romance between commoner-turned-tycoon Seong Hee-ju and Prince Ian. The series airs Fridays and Saturdays at 9:50 p.m. thunder@sportsseoul.com











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