The IU yacht kiss has quickly become the defining moment of Episode 6 of MBC’s Friday-Saturday drama 21st Century Grand Prince’s Wife. In the episode aired on April 25, 2026, Lee An Grand Prince, played by Byeon Woo Seok, publicly proposed to Sung Hee Joo, played by IU, and the story moved from political and emotional tension into a much more intimate romantic turn. By the end of the episode, the two were on a yacht, standing close enough for uncertainty to become action, and Lee An Grand Prince kissed Sung Hee Joo as the episode came to a dramatic close.
The IU yacht kiss and the build-up to Episode 6
What made the yacht scene land was not only the kiss itself, but the sequence of events that led there. Episode 6 centered on Lee An Grand Prince and Sung Hee Joo growing closer after recognizing that they shared similar emotional wounds. Their relationship had already been complicated by status, expectations, and the formal nature of their arrangement, but this episode gave them more space to see each other beyond those roles.
The most decisive turn came when Lee An Grand Prince publicly proposed to Sung Hee Joo. That was not a quiet or private confession; it was a bold move that pushed their relationship into the open. After the king gave his permission, the pair were formally recognized as an engaged couple. That approval changed the atmosphere around them, giving their bond a new public shape while still leaving plenty of personal uncertainty between the two.
The episode also included the two writing a marriage contract, adding another layer to their relationship. Rather than presenting romance as simple or effortless, the drama placed emotional closeness beside formal agreement. That contrast is part of what makes the characters’ dynamic interesting: they are bound by public decisions and written terms, yet the emotional reality between them is still unfolding in real time.
A yacht date turns into a defining romantic scene
After the proposal and royal approval, Sung Hee Joo prepared a yacht outing, giving the two characters a rare chance to step outside the usual palace setting. On the yacht, Lee An Grand Prince experienced something close to a break from his restrained life, including eating food outside a restaurant for the first time. The date carried the feeling of escape, even if only briefly.
That sense of freedom helped soften the scene. The characters were not simply standing in a grand formal setting; they were away from the palace, sharing a quieter space where their guarded emotions could surface. During the yacht date, Sung Hee Joo swayed and ended up in Lee An Grand Prince’s arms. The physical closeness turned the emotional tension into a direct romantic moment, and he kissed her.
Some accounts describe this as their second kiss, which gives the yacht moment an added sense of progression rather than a sudden beginning. It was not just a first spark; it was another step in a relationship that has been moving through hesitation, pressure, and attraction. The scene closed Episode 6 with a strong romantic cliffhanger, leaving viewers to sit with the question of what the kiss means for both characters.
The preview for Episode 7 added to that curiosity. Sung Hee Joo is shown asking Lee An Grand Prince, “Do you perhaps like me?” That question is simple, but in this story it carries weight. After a public proposal, a marriage contract, royal approval, and a kiss, she is still trying to understand whether his feelings are genuine. That uncertainty is exactly the kind of emotional hook that keeps a romance drama moving.
Ratings show the moment connected with viewers
Episode 6 did more than generate conversation around IU and Byeon Woo Seok’s chemistry. It also delivered the drama’s highest ratings so far. The April 25 broadcast recorded 11.2 percent nationwide, setting a new personal best for 21st Century Grand Prince’s Wife. That figure surpassed the drama’s previous high of 11.1 percent from Episode 4.
The episode also reached 11.3 percent in the metropolitan area, while its highest minute-by-minute rating climbed to 13.4 percent. One highlighted peak came during the scene where Sung Hee Joo told Lee An Grand Prince, “Do everything you want to do.” Within the available information, that line stands out as one of the episode’s strongest audience-response moments, reflecting how invested viewers were in the emotional exchange between the two leads.
For fans, the appeal is easy to understand. The episode combined several major romance-drama ingredients: a public proposal, official approval, a contract marriage element, shared emotional scars, a date outside the palace, and a kiss staged as a closing moment. Each piece added momentum, but the yacht scene became the image that pulled everything together.
In the end, Episode 6 turned Lee An Grand Prince and Sung Hee Joo’s relationship into the drama’s central talking point, with the IU yacht kiss serving as both a romantic payoff and a cliffhanger. With Episode 7 already teasing a direct question about his feelings, the next chapter has plenty to answer.
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