BLACKPINK’s Jisoo and actor Seo Kang-jun have suddenly found themselves at the centre of a dating-rumour storm, and this time, fans are looking far beyond on-screen chemistry. A viral social-media post has sent fans into detective mode, with alleged similarities involving Instagram photos, jewellery, travel locations and even a BLACKPINK concert becoming the focus of intense online discussion.
The speculation is especially intriguing because Jisoo and Seo Kang-jun already have a romantic connection on screen through Netflix’s 2026 series Boyfriend on Demand. But while fans are having plenty of fun connecting the dots, one crucial detail remains unchanged: neither Jisoo nor Seo Kang-jun has publicly confirmed that they are dating, and no official relationship announcement has been made by their agencies.
How did the Jisoo and Seo Kang-jun dating rumours begin?
The latest wave of speculation appears to trace back to an X post published on September 21, questioning whether the two stars might have a relationship that fans had previously missed.
The post stated:
“Jisoo and Kangjoon are acting really suspicious🧐”
The post reportedly went on to attract more than a million views, pushing the alleged clues into a much wider online conversation.
Rather than relying on one definitive photograph or confirmed sighting, the theory brought together several observations that fans believed could point toward a connection between Jisoo and Seo Kang-jun.
Among the details highlighted were:
| Alleged clue | What fans pointed to |
| Instagram profiles | Similar or matching-looking profile photographs |
| New York | Jisoo and Seo Kang-jun reportedly being in New York around the same time |
| Ring | A ring fans believed looked similar on both stars |
| BLACKPINK concert | Seo Kang-jun’s reported attendance at a BLACKPINK concert |
| Existing connection | Their work together in Boyfriend on Demand |
Individually, none of these observations establishes a romantic relationship. Together, however, they became the foundation of the viral theory.
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The matching ring theory has fans comparing photos
The jewellery clue has become one of the most heavily discussed parts of the speculation.
According to the original viral post, Seo Kang-jun was not known by the poster’s source as someone who regularly wears rings. The post then drew attention to what appeared to be a ring on his ring finger and compared it with a ring associated with Jisoo.
The original post said:
“Kangjoon never wears rings. I learned this from one of his fans, but he was wearing a ring on his ring finger that looked the same as Jisoo’s.”
That observation was subsequently repeated across entertainment and fan communities, where users began comparing photographs of the two stars.
But there is an important line between noticing a similarity and establishing a relationship. A similar-looking ring is not proof that two celebrities are dating. Jewellery can be coincidental, connected to fashion or simply part of a styling choice.
Neither Jisoo nor Seo Kang-jun has identified the ring as a couple ring.
That makes the jewellery comparison a fan interpretation rather than confirmed evidence of a relationship.
Did Jisoo and Seo Kang-jun overlap in New York?
New York has also become part of the growing theory.
Fans pointed to reports and social-media activity suggesting that Jisoo and Seo Kang-jun were in New York around the same period. The timing attracted attention because Jisoo was publicly active in New York during September, including appearances connected to New York Fashion Week.
Her presence in the city and interactions with fans were documented during the trip, giving fans material to examine alongside Seo Kang-jun’s reported activities.
However, sharing the same major international city does not establish that two people were together privately.
The New York connection therefore remains exactly that: a location overlap that fans have incorporated into a larger theory.
For social-media users already comparing photographs and jewellery, though, the timing became another piece of the puzzle.
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Seo Kang-jun’s reported BLACKPINK concert appearance adds another twist
Then came the detail that arguably gave the online theory another boost: Seo Kang-jun’s reported attendance at a BLACKPINK concert.
The original viral post presented his reported appearance as particularly unusual. It claimed that the actor had not previously been known for attending his colleagues’ movie premieres or concerts.
It also described him as someone who dislikes leaving the house and sweating before connecting his reported concert attendance to Jisoo.
The post said:
“By the way, he had never gone to any of his colleagues’ movie premieres or concerts before. He hates leaving the house and sweating, but he came to the concert to support Jisoo on one of the hottest days of the year🤪”
That claim quickly became another talking point for fans.
Some interpreted the reported concert appearance as possible personal support for Jisoo, particularly because the two had already worked together on a romance series.
But the distinction matters: attendance at a BLACKPINK concert does not establish that Seo Kang-jun attended specifically because of a romantic relationship with Jisoo.
The connection between the event and the dating theory comes from fan interpretation of the circumstances.
Fans are reacting with excitement to the possibility
Interestingly, the speculation has not been met primarily with rejection or concern. Many fans have embraced the possibility, especially because Jisoo and Seo Kang-jun already played romantic roles within the fictional world of Boyfriend on Demand.
Some fans focused on the reported concert appearance.
One reaction read:
“Wait… if I remember correctly, he isn’t someone who goes to concerts, but he did for Jisoo.”
Another fan joked about the possibility of their fictional pairing becoming something more in real life:
“the possibility this ship becoming real and not only in kdrama 🤩”
Other reactions described Jisoo and Seo Kang-jun as an especially visually striking pairing, while some fans said they would happily support the two if the rumours eventually proved true.
The enthusiasm itself has helped keep the discussion moving across social media.
Jisoo and Seo Kang-jun already share a romantic drama history
There is a very obvious reason this particular rumour has captured so much attention.
Jisoo and Seo Kang-jun are already co-stars in Netflix’s 2026 romantic comedy Boyfriend on Demand.
Jisoo plays Seo Mi-rae, an overworked webtoon producer who turns to a virtual dating service that allows her to experience different romantic scenarios. Seo Kang-jun is among the actors involved in the series’ virtual dating storyline, portraying one of Mi-rae’s various virtual romantic partners.
Netflix’s official promotional material presents the series as an exploration of the difference between idealised romance and relationships in the real world.
The ensemble also includes Seo In-guk, Yoo In-na, Ha Young, Lee Soo-hyuk, Ong Seong-wu, Lee Jae-wook, Lee Hyun-wook, Jay Park, Kim Young-dae and Lee Sang-yi.
That professional connection gives fans a ready-made explanation for why the pair might appear to have chemistry. It also makes the idea of their fictional romance becoming a real-life relationship especially appealing to sections of the fandom.
But the drama remains fiction, while the current dating claims concern the actors’ private lives.
Their Boyfriend on Demand chemistry is adding fuel to the speculation
Dating speculation involving co-stars is not unusual, particularly when viewers become invested in a convincing romantic pairing.
In Jisoo and Seo Kang-jun’s case, the timing has made their Boyfriend on Demand connection even more significant.
Fans have already watched Jisoo’s character navigate different forms of romance in the series, moving between virtual fantasy and real-world relationships. That fictional setup has created an easy bridge for online audiences imagining whether the actors could share a similar connection away from the screen.
Netflix’s presentation of Boyfriend on Demand centres on romantic connection, idealised relationships and the contrast between fantasy and reality.
That makes the current online conversation almost perfectly suited to the fandom’s imagination.
Still, promotional chemistry and fictional romance should not be treated as evidence about the actors’ private lives.
Jisoo and Seo Kang-jun working together confirms that they are professional colleagues and co-stars. It does not confirm a romantic relationship outside the series.
What is actually confirmed about the Jisoo and Seo Kang-jun relationship rumours?
Despite the speed at which the speculation has travelled online, there has been no official confirmation that Jisoo and Seo Kang-jun are dating.
The reports surrounding the story have characterised the claims as unverified. The material currently driving the discussion consists primarily of fan observations involving Instagram posts, rings, locations and Seo Kang-jun’s reported attendance at a BLACKPINK concert.
That leaves the current status straightforward:
Jisoo and Seo Kang-jun are confirmed co-stars, but their alleged romantic relationship has not been confirmed.
There has been no public confirmation from either celebrity, and no official relationship announcement has been made by their agencies.
Until Jisoo, Seo Kang-jun or an authorised representative addresses the speculation, the alleged clues circulating online remain interpretations made by fans.
Why are these dating rumours spreading so quickly?
The theory has several elements that naturally lend themselves to social-media discussion.
The first is the pair’s existing connection through a Netflix romantic series. The second is the alleged similarity between their social-media profile imagery. The third is the matching-ring theory, which gives fans a physical detail that can easily be presented through side-by-side photographs.
Then there is the reported New York overlap, followed by Seo Kang-jun’s reported BLACKPINK concert appearance.
Put together, those details transformed what could have remained a collection of unrelated observations into a much larger online discussion.
But virality and verification are two different things.
The fact that a theory attracts more than a million views does not turn the theory into confirmed information. Likewise, multiple coincidences can encourage speculation without establishing what happened privately between two people.
For now, the Jisoo and Seo Kang-jun dating story remains unconfirmed
The online excitement is unlikely to disappear immediately, particularly while fans continue discussing the alleged similarities and the pair’s existing Boyfriend on Demand connection.
Some fans are openly enjoying the possibility that the fictional pairing could become real, while others are simply following the social-media detective work surrounding the two stars.
But the available information does not establish that Jisoo and Seo Kang-jun are dating.
The similar Instagram imagery, similar-looking ring, reported New York overlap and reported BLACKPINK concert attendance can all be interpreted in different ways. None has been presented as official confirmation of a romantic relationship.
For now, the clearest distinction is between what is known and what fans believe they have discovered: Jisoo and Seo Kang-jun are Boyfriend on Demand co-stars, while reports of a real-life romance remain unconfirmed dating speculation.
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Conclusion
Jisoo and Seo Kang-jun have become the subject of major online dating speculation after fans connected a viral September 21 X post with alleged Instagram similarities, a matching-looking ring, a reported New York overlap and Seo Kang-jun’s reported appearance at a BLACKPINK concert.
Their Boyfriend on Demand connection has made the theory even more exciting for fans, many of whom have reacted positively to the possibility of the on-screen pairing becoming real.
Yet no official relationship has been confirmed. Until either star or an authorised representative makes a statement, the alleged clues remain fan interpretations rather than established proof.
Source and Research Disclaimer
This article has been prepared based on thorough research of the sources provided for the story, including Netflix’s official Boyfriend on Demand materials, Netflix Tudum, Zapzee, India Times, IBTimes Singapore and Koreaboo. The article reflects the information available from those sources and distinguishes reported claims and fan speculation from confirmed information. It does not present the alleged relationship between Jisoo and Seo Kang-jun as established fact.
Sources
- Zapzee: BLACKPINK’s Jisoo and Seo Kang Jun Spark Dating Speculation Online
- India Times: Jisoo and Seo Kang Joon dating rumours explained
- IBTimes Singapore: Jisoo and Seo Kang Joon dating speculation
- Koreaboo: Viral allegations involving Jisoo and Seo Kang Joon
Featured Image Credit: Netflix
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