According to Koreaboo, before that, Jisoo of Blackpink posted a few photos with Seo In Guk on her personal Instagram, making the online community jokingly call this a type of "lovestagram" (post implicitly dating). The photos quickly spread and created a wave of speculation about the relationship between the two stars.
However, what made the rumors erupt more strongly came from the recent joint appearance of the two at a press conference related to "Boyfriend on Demand". In clips and photos shared from the event, Jisoo and Seo In Guk were constantly scrutinized by fans for their small looks, gestures and interactions that were commented to have a clear "chemical reaction".

On forums, many posts summarizing the moments of the two main actors attracted a large amount of interaction, followed by a series of comments saying that this closeness "is not just like colleagues". Some people emphasized that "the way they look at each other" is the detail that makes fans most moved.
However, up to now, neither Jisoo nor Seo In Guk have made official comments on the rumors.
Boyfriend on Demand" is currently a project of interest with the participation of Jisoo and Seo In Guk. The film exploits a romantic love story mixed with technology/science fiction elements. Although the content received many positive feedbacks, the performance of the Blackpink female member continues to face mixed opinions. Many viewers believe that Jisoo's performance does not convey the desired emotions.