IU and Byeon Woo-seok’s kiss scenes in MBC’s 21st Century Grand Prince’s Wife became a compact storyline of their own across April and May 2026. The IU Byeon Kiss conversation was not built around a single moment, but around a sequence: a difficult wall-kiss shoot, strong episode ratings, a baseball-stadium tease, a yacht kiss, and a later OST release tied directly to that romance.
IU and Byeon Woo-seok Kiss Scene Timeline

The first major update came before the most-discussed broadcast numbers. Sports Donga reported on April 14, 2026, that IU and Byeon Woo-seok discussed the wall kiss scene from 21st Century Grand Prince’s Wife during an appearance on TEO’s YouTube channel Salon Drip. Their comments framed the scene less as a simple romantic beat and more as a demanding production moment, with hot weather and repeated takes making the shoot take longer than viewers might assume. IU said they did it “countless times,” while Byeon Woo-seok also said the scene was filmed many times.1
That behind-the-scenes account helped explain why the later broadcast reaction was so focused on the wall kiss. iMBC reported on April 18, 2026, that the episode 3 ending wall kiss reached a peak minute-by-minute rating of 12.7%. The same report listed episode 3 at 9.4% in the metropolitan area, 9.0% nationwide, and 4.6% among viewers aged 20 to 54, ranking first among all Friday programs.2
A related preview then shifted attention from the wall to a public date setting. A News1 report carried by Financial News on April 18, 2026, said episode 4, scheduled to air that day, would show IU and Byeon Woo-seok’s characters on a baseball-stadium date, where they were caught on the stadium screen during “kiss time.” The report tied that preview directly to the question of whether the romance would continue after the previous episode’s first kiss.3
| Date reported | Scene or update | Source-backed detail |
|---|---|---|
| April 14, 2026 | Wall kiss behind the scenes | IU and Byeon Woo-seok described repeated filming in hot conditions.1 |
| April 18, 2026 | Episode 3 wall kiss | The ending kiss reached a peak minute-by-minute rating of 12.7%.2 |
| April 18, 2026 | Episode 4 baseball “kiss time” preview | A stadium-date scene placed the pair on the kiss-time screen.3 |
| April 26, 2026 | Episode 6 yacht kiss | The yacht kiss aired with episode 6 ratings of 11.3% metropolitan and 11.2% nationwide.4 |
| May 2, 2026 | OST Part.8 release | Kakao Entertainment released “You Keep Me Here,” used in the yacht romance scene.5 |
From Wall Kiss to Yacht Kiss
The wall kiss and yacht kiss became the two major reference points for the drama’s romantic arc. iMBC’s April 29, 2026, official recap identified the episode 3 wall kiss and episode 6 yacht kiss as representative ending scenes of 21st Century Grand Prince’s Wife. The recap described the wall kiss as part of the emotional change after a contract marriage, while the yacht kiss functioned as a moment in which the characters confirmed their sincerity toward each other.6
The episode 6 yacht scene also carried strong ratings data. iMBC reported on April 26, 2026, that the yacht kiss between Seong Hee-joo and Grand Prince Ian aired in episode 6, alongside proposal and yacht-date developments. The episode recorded 11.3% in the metropolitan area, 11.2% nationwide, and 5.9% among viewers aged 20 to 54. The report also stated that the nationwide and 20-to-54 ratings marked new personal bests for the series.4
This is why the two kiss scenes belong together in a curated view. The wall kiss established the emotional shift after the contract-marriage setup and drew a peak rating figure. The yacht kiss then extended the romance into a more openly sincere stage, with another ratings milestone attached. The baseball-stadium “kiss time” preview sits between them as a lighter bridge, keeping the question of public romance active after the first kiss but before the more decisive yacht sequence.
The available reports do not provide a broader full-episode plot breakdown beyond these scene-focused updates. What they do establish is a clear pattern: the drama’s coverage repeatedly returned to romantic endings, public-facing date scenes, and the production or music details that made those moments stand out.
Why the OST Release Matters
The final piece in this roundup is the music. iMBC reported on May 2, 2026, that Kakao Entertainment released OST Part.8 “You Keep Me Here”, the song used in the episode 6 onboard romance scene. The report specifically connected the track to IU and Byeon Woo-seok’s yacht kiss, describing it as music that heightened the romantic mood of the scene.5
That release turned the yacht kiss from a one-episode highlight into a reusable drama marker. Viewers who followed the romance through the wall kiss, the baseball kiss-time preview, and the yacht sequence could now identify the background music linked to the later scene. In entertainment coverage, that matters because OST releases often give a drama moment a second life outside the episode itself, especially when the song is tied to a clearly identified scene.

Taken together, the available reports show how IU and Byeon Woo-seok’s kiss scenes were covered as a connected set of romance milestones rather than isolated clips. The wall kiss supplied the behind-the-scenes story and a strong peak rating, the baseball “kiss time” preview kept the romance in motion, the yacht kiss marked a more sincere emotional turn, and “You Keep Me Here” gave the episode 6 moment a musical afterlife.
References
- “셀 수 없이 했다”…아이유♥변우석, 키스신 비하인드 [DA클립] (스포츠동아, 2026-04-14)
- MBC ‘21세기 대군부인’ 아이유-변우석 달콤한 입맞춤 ‘최고 12.7%’ (iMBC 연예, 2026-04-18)
- '대군부인' 아이유·변우석, 입맞춤 한번 더?…야구장 키스타임 포착 (파이낸셜뉴스 / 뉴스1, 2026-04-18)
- MBC '21세기 대군부인' 아이유-변우석, 선상 위 입맞춤…분당 최고 13.4% (iMBC 연예, 2026-04-26)
- MBC ‘21세기 대군부인’ 아이유♥변우석 키스신 배경음악 오늘(2일) 발매 (iMBC 연예, 2026-05-02)
- 아이유♥변우석, 요트 키스…MBC '21세기 대군부인' 로맨틱 엔딩 맛집 (iMBC 연예, 2026-04-29)