In the ever-competitive world of Korean television, few dramas have managed to capture the nation’s attention quite like MBC’s Friday-Saturday series 21st Century Grand Lady (21세기 대군부인). Starring IU and Byeon Woo-seok, the drama has become a cultural phenomenon since its debut, dominating not just ratings but also sparking lively debates about acting, behind-the-scenes antics, and the shifting tides of viewer loyalty across competing programs. As of April 16, 2026, the series has not only climbed to a remarkable 63% integrated buzz rate across TV and OTT platforms, but it has also managed to shake up the drama landscape, leaving both fans and critics eager for every new episode.
The meteoric rise of 21st Century Grand Lady began with its first episode, which aired to a solid 7.8% viewership. By the second episode, that number had soared to 9.5%, according to MyDaily, marking it as the most anticipated hit drama of the first half of 2026. This surge came as a direct challenge to rival programs, most notably SBS’s Shin Yi-rang Law Office (신이랑 법률사무소), which saw its own ratings tumble from a previous high of 10.0% down to 6.7% and 6.6% for episodes 9 and 10, the lowest since its debut. As TenAsia noted, this decline coincided with the broadcast of IU and Byeon Woo-seok’s new drama, underscoring the powerful draw of their star power and the public’s insatiable curiosity.
Yet, popularity brings scrutiny. Both IU and Byeon Woo-seok have faced their share of criticism as the drama’s success has grown. IU, whose acting career has included acclaimed roles in Dream High, My Mister, and Hotel Del Luna, has been critiqued for portraying characters that some viewers feel are too similar. Detractors argue that her latest role, Sung Hee-joo, is not markedly different from her previous turn as Jang Man-wol in Hotel Del Luna. However, as MyDaily reports, IU herself has pointed out that while the two characters share traits, Hee-joo is imbued with more comedic elements, setting her apart in tone and delivery. Time and again, IU has faced such skepticism, only to win over critics with her nuanced performances as each series unfolds.
Byeon Woo-seok, meanwhile, is navigating the transition from supporting roles to leading man. After years in minor roles, he achieved stardom with Carry Sunjae on My Back (선재 업고 튀어), but the spotlight has brought with it a harsh focus on his acting. Critics have pointed to limited emotional range and vocal issues, particularly in scenes requiring intense confrontation. Still, as MyDaily observes, much of this restraint is consistent with the reserved nature of his character. Byeon’s approach has leaned on dynamic physical sequences—horseback riding, archery, and even shirtless scenes—to emphasize his strengths and compensate for perceived weaknesses. Whether this strategy will ultimately silence doubters remains to be seen, but the actor’s efforts are evident.
Behind the scenes, the camaraderie between the leads and their colleagues has offered fans a different perspective. On April 14, the YouTube channel ‘Disney Plus Korea’ posted a lighthearted Q&A with IU and Byeon Woo-seok, revealing a humorous moment from filming. IU recounted, “It was a time when Woo-seok and I were just getting close. We were filming a scene separated by a wall, and as it dragged on towards late-night snack time, I asked the staff, ‘What is today’s late-night snack?’ over the wall.” She continued, “Woo-seok looked at me and said, ‘Busy,’ so I immediately apologized, thinking I’d been insensitive. But then he clarified, ‘Rice burger.’ I thought he was saying he was busy, but he was just answering my question!” The two actors laughed about the misunderstanding, a moment that, as IU recalled, “helped us grow closer.”
Byeon Woo-seok’s warmth extends beyond his interactions with IU. According to footage released by his agency Baro Entertainment on April 13, Byeon meticulously prepared for emotionally charged scenes, encouraging co-star Gong Seung-yeon before filming a tense confrontation. Despite the cold weather on set, he provided padded jackets to staff members to keep them warm—a gesture that did not go unnoticed. During horseback riding scenes, Byeon joked about the physical toll of the role, saying, “In this project, I lost my eyesight. In every project, it’s something different—this time it’s my eyes.” IU responded with characteristic wit, “I’m lucky to have so much to lose!” The lighthearted banter underscored the supportive environment on set.
The production’s atmosphere was further highlighted during scenes involving child actor Kim Eun-ho, who plays the king and Byeon’s character’s nephew. Byeon doted on Kim, gifting him a paper frog and guiding him through the emotional beats of their scenes together. Jo Jae-yoon, another co-star, praised Byeon’s personality, quipping, “This is why everyone talks about Byeon Woo-seok. He’s amazing.” Such moments of camaraderie and mutual support have only deepened fans’ affection for the cast.
Meanwhile, the drama has not been immune to external challenges. MyDaily pointed out that excessive product placements (PPL) within 21st Century Grand Lady have at times disrupted the emotional immersion of viewers and placed additional pressure on the lead actors to maintain the integrity of their performances. The balancing act between commercial interests and artistic expression is a familiar one in the industry, but it has become a particularly hot topic given the show’s high profile.
Outside the drama sphere, the influence of IU and Byeon Woo-seok has spilled over into the variety show world. On April 14, their appearance on the YouTube web program ‘Salon Drip’ was pre-released on TEO’s channel at 6 PM, then broadcast on MBC Drama Net at 8 PM. Hosted by comedian Jang Do-yeon and produced by the team behind famed producer Kim Tae-ho, the show gave fans a glimpse of the stars’ candid, playful sides—quite a contrast to their dramatic on-screen personas. MBC Drama Net’s decision to air the special episode was intended to bring their genuine charm to a broader audience, and industry insiders have predicted that the move will “offer fresh delight to both fans of the actors and regular viewers of ‘Salon Drip’.”
Elsewhere in the entertainment landscape, the ripple effect of 21st Century Grand Lady’s success is being felt. The drama’s ratings have coincided with a noticeable dip in viewership for SBS’s Shin Yi-rang Law Office, even as actress Lee Som’s performance as Han Na-hyun has garnered widespread praise for its subtlety and emotional depth. The contrast between the acting debates surrounding IU and Byeon Woo-seok and the accolades for Lee Som is a reminder of the diverse standards and tastes within the Korean drama audience.
With the third episode of 21st Century Grand Lady set to air on April 17 at 9:50 PM on MBC and Disney+, anticipation remains sky-high. As the series continues to break records and ignite conversation, the question lingers: can IU and Byeon Woo-seok not only sustain their drama’s momentum but also silence their critics with performances that rise above the noise? Only time—and perhaps a few more behind-the-scenes laughs—will tell.