"Geudaeneyo," sung by IU and Byeon Woo-seok, is leaving a deep impression on fans. Even after time has passed, viewers continue to return to the duet video, where the two stars' voices blend together. With the chemistry they displayed in the drama "The 21st Century Grand Prince's Wife" extending into music, fans are now looking forward to seeing the pair perform new duet stages together.

The video, "[Mini Piece Collection] Geudaeneyo Clip (with Byeon Woo-seok)," has been met with a stream of comments praising the vocal tones of IU and Byeon Woo-seok. In particular, fans calling the two a "perfect couple" expressed delight at finding in the song the same emotions they felt from the characters' relationship in the drama.

One viewer said, "I closed my eyes and just listened, and their harmony is so perfect it genuinely moved me," praising how well the two voices blend. Another fan commented, "How can their voices suit each other this well?" conveying the warm feelings the song gave them.

■ "Each voice is distinct, yet they connect naturally"

What fans focused on was the harmony created by two very different voices. Praise continued for the way IU's delicate expression and Byeon Woo-seok's gentle tone complement each other, and some viewers highly rated the fact that each voice remains clearly distinguishable while still connecting naturally.

Reactions to Byeon Woo-seok's singing ability drew particular attention. One fan said, "I didn't know Byeon Woo-seok could sing so well," noting they had discovered an unexpected charm. Another viewer said, "Byeon Woo-seok's pure, warm, and soft tone gives comfort and consolation," expressing the emotions they felt from his voice.

Some voiced hopes that Byeon Woo-seok would continue singing more often in the future. One fan said many people love his singing voice and expressed a wish to see more of his musical activities. Another fan hoped the duet would be officially released as a digital single.

IU's harmonies also received praise. One viewer said they were happy to hear "Geudaeneyo" performed live for the first time in a long while, and another fan recalled hearing the song on a past broadcast, expressing special fondness for this duet.

■ Interest Tied to the Lingering Afterglow of "The 21st Century Grand Prince's Wife"

The interest in this video is also tied to the lingering afterglow of the drama. Fans mentioned Prince Ian and Sung Hee-joo from the series, recalling the emotional arc the two characters created. One viewer said, "Because they never got to properly say goodbye, this perfect couple leaves me caring, worrying, and missing them — I can't help but root for them," expressing affection that has continued even after the drama ended. Another fan commented that rewatching the duet video after the finale made it feel even more bittersweet.

These reactions show that a drama's story does not vanish from viewers' memories the moment it ends. The emotions felt toward the characters combined with the actors' voices, extending into the experience of listening to the song again.

■ Leading the Netizens' Awards Best Actor Poll

The steady interest in Byeon Woo-seok is also evident at the Netizens' Awards. As of the afternoon of the 22nd, Byeon Woo-seok ranks first in the Netizens' Awards Best Actor category for October. With fan interest continuing not only in his acting from the drama but also in the new charms revealed outside the work, his hold on the top spot in the Best Actor category is drawing attention.

Notably, given that the lingering impression of the series shows no signs of fading easily, Byeon Woo-seok's current trajectory is all the more remarkable. The affection for his drama character has extended into interest in the actor himself, and this fan sentiment is making its presence felt in the Netizens' Awards ranking race. Attention is now focused on whether Byeon Woo-seok, who maintains his lead in the October Best Actor category, can sustain this momentum through the remaining period.

■ "Raise your hand if you're still coming back to listen in July"... Repeated Returns

Fans' repeat visits have also stood out. The comment "Raise your hand if you're still coming back to listen in July" received hundreds of likes and numerous replies. Comments continued from those who returned again in September and October, showing that the video is not a one-time viewing but is being consumed repeatedly.

One viewer said they keep finding themselves listening to the song as the weather turns chilly, and congratulated the video on reaching 3 million views. Another fan said they listened to the song all night, showing their affection for the two voices.

For fans, returning to the music has become a way to relive the drama's emotions. For viewers who remember the characters' relationship, "Geudaeneyo" was received not simply as a duet but as a song that brings back the excitement and lingering regret felt while watching the series.

■ Calls for New Collaborations

Voices hoping for new collaborations between the two also continued. One fan said, "These two should prepare for a year-end stage," expecting a joint performance, while another suggested that with vocal tones this well-matched, they should release one more new duet song. There were also requests for a duet album. Some fans expressed expectations related to the OST of "The 21st Century Grand Prince's Wife," hoping to hear IU and Byeon Woo-seok's voices together in other songs as well.

However, these comments represent fans' hopes and do not mean that plans for a new duet song or album release have been confirmed.

■ Acting and Singing: Chemistry, Not Separate Activities

What is interesting about the "Geudaeneyo" video is that fans do not treat the actors' acting and singing as separate activities. The chemistry the two showed in the drama influenced how viewers appreciate the duet. Audiences discussed not only the harmony of their voices but also the emotion embedded in the song and even the way they looked at each other.

One fan evaluated, "The two actors poured dramatic emotion into this song, gifting us a beauty that will remain in our hearts for a long time." This comment shows that the duet simultaneously evoked musical appreciation and memories of the drama for fans.

The lingering impression left by IU and Byeon Woo-seok's "Geudaeneyo" was created by the overlap of praise for the song itself and longing for the two characters in the drama. Fans rewatch the video while reminiscing about the past work and hope to see the pair again on new stages. The drama has ended, but interest in the two voices continues.

The comments from fans who keep returning to the song even after time has passed show that "Geudaeneyo" has become yet another space for remembering IU and Byeon Woo-seok's chemistry. With the addition of Byeon Woo-seok's current position atop the Netizens' Awards Best Actor category, attention is focused on what results the fans' unwavering affection for him will bring at the end of October.

[This article was written based on publicly available video titles and viewer comments. Musical evaluations and expectations for future collaborations are the personal opinions of commenters. AI provided partial assistance.]