Now that IU and Lee Jong Suk have officially confirmed the end of their relationship, fans are looking back at the past year and suggesting that the signs may have been there all along. While their agencies only recently announced the breakup, many online believe the couple’s increasingly low-profile public presence had already hinted that something had changed behind the scenes.

The couple, who publicly confirmed their relationship in December 2022, had been one of South Korea’s most closely followed celebrity pairs for nearly four years. Throughout most of their relationship, however, they were known for keeping their private lives out of the spotlight, making any public appearance—or absence—an immediate topic of discussion among fans.

One moment in particular has now resurfaced.

Last year, photos of IU celebrating her birthday with BTS’s V and actress Kang Han Na circulated widely online. While the celebration itself attracted attention, many fans noticed that Lee Jong Suk was nowhere to be seen. The absence quickly fueled speculation that the couple’s relationship had cooled.

At the time, however, those rumors were dismissed.

A source close to the couple reportedly insisted that IU and Lee Jong Suk were “still happily together,” while both agencies declined to comment. As a result, many fans assumed the speculation had simply been another unfounded celebrity dating rumor.

Now, following the official breakup announcement, some netizens have returned to that moment and are calling it the biggest “warning sign” in hindsight.

Fans have also pointed to what they describe as a gradual change in the couple’s public interactions over the past year. According to many online discussions, IU and Lee Jong Suk rarely mentioned each other publicly, and opportunities to see them together became increasingly uncommon.

Older comments posted months ago have also resurfaced across social media.

Some fans shared posts they had written long before the breakup was confirmed, saying things like, “There has barely been any new content about them lately,” or “I had a bad feeling about this.” Others claimed they had noticed subtle changes in Lee Jong Suk’s recent social media activity but chose not to speculate publicly at the time.

The renewed discussion has spread rapidly across platforms such as X, where many users are debating whether the signs were genuinely obvious or only appear meaningful now that the relationship has officially ended.

It’s important, however, to separate hindsight from confirmed facts.

While fans are connecting past events to the breakup, neither IU nor Lee Jong Suk has stated that these moments had anything to do with the end of their relationship. Their agencies have confirmed only that the couple has broken up and will remain on good terms as colleagues. No official reason for the split has been disclosed.

Because of that, claims that a birthday party, fewer public mentions, or social media activity were definitive indicators of a breakup remain speculation rather than established fact.

At the same time, both stars have maintained exceptionally busy careers over the past year.

IU spent much of the first half of the year starring in Perfect Crown, releasing her remake album Flower Bookmark 3, and preparing for upcoming music projects and live performances. Meanwhile, Lee Jong Suk has been preparing to begin filming The Remarried Empress while juggling an extensive domestic and international shooting schedule.

Their demanding professional commitments may also explain why they appeared together less frequently, making it difficult to draw firm conclusions from their public appearances alone.

Still, with the breakup now officially confirmed, fans continue to revisit old interviews, photos, and social media posts in search of clues they may have overlooked. Whether those moments were genuine warning signs or simply ordinary events viewed through the lens of hindsight remains impossible to verify.

For now, one thing is certain: IU and Lee Jong Suk’s relationship has officially come to an end, but the online conversation surrounding when it may have happened—and whether fans unknowingly witnessed the signs months earlier—is likely to continue for some time.