Top 5 Reasons Why ‘21st Century Grand Duchess’ Starring IU and Byun Woo-seok is a Must-Watch!

Daniel Kim | 2026.04.05

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 IU Instagram
 IU Instagram

[MyDaily = Reporter Kim Do-hyung] Couple content featuring actor Byeon Woo-seok and singer-actress IU shows no sign of slowing.

On April 5, IU uploaded 13 photos to her social account under the caption '21세기 대군부인' (21st Century Grand Lady).

The images evoke a cinematic mood across several distinct concepts. IU appears in a pink, lace-trimmed dress that reads both fresh and dreamlike, while Byeon Woo-seok opts for a casually undone tie over a shirt, striking a natural yet refined tone.

A shot of the two seated closely conveys a quiet tension and palpable chemistry, giving the images an authentic, real-couple intimacy. In another frame, where they stand hand in hand, their striking proportions and complementary visuals draw immediate attention.

 IU Instagram
 IU Instagram

In a different scene, IU sits in a white dress and delivers a deep, mature stare that suggests a more grown-up persona. Posed in front of a floral set, she brings a soft, wistful sensibility, proving each concept reveals a new facet of her charm.

IU will reunite with Byeon Woo-seok on-screen in '21세기 대군부인.'

'21세기 대군부인' is set in a 21st-century constitutional monarchy in South Korea. The drama follows a commoner woman who, despite outward advantages, is constrained by her social status, and a sorrowful prince—the king's son—who appears to have nothing. Together, they push back against fate and class boundaries in a romance about dismantling social hierarchies. The series premieres on the 10th at 9:40 p.m.

The production is mounting a major promotional push, rolling out a main teaser, highlight reels, interviews and photo spreads. On the 4th, the team released a YouTube clip for 'TteunTteun-Pinggaego,' and radio appearances with Lee Sang-soon and Yoo In-na are also planned.

This steady stream of promotional content is expected to continue from the production press conference on the 6th up through the premiere.