CONFIRMED (professional): Jisoo and actor Seo Kang Joon are connected through Netflix’s 2026 romantic comedy Boyfriend on Demand. Coverage notes Seo Kang Joon appears among actors portraying the heroine’s virtual boyfriends; that is a cast credit, not a dating announcement.
UNCONFIRMED (dating): A viral X thread claimed the two were acting “suspicious,” pointing to similar Instagram imagery, an alleged matching ring on Seo Kang Joon’s ring finger, reported overlapping New York timing, and his appearance at a BLACKPINK concert. IBTimes Singapore (opens in new tab) and Koreaboo (opens in new tab) both stress these are fan observations — not verified evidence of a romance.
ON RECORD (not about each other): Seo Kang Joon recently discussed unrequited love and dating history on a September 2026 YouTube appearance; nothing in that interview publicly links him to Jisoo. Jisoo has spoken generally about relationships in past interviews and has not addressed this rumor in the coverage cited. Her only publicly confirmed past relationship covered here was with Ahn Bo Hyun (2023), which ended after agencies confirmed a breakup.
RUMOR STAMP: Co-stars, jewelry coincidences, and concert attendance have many non-romance explanations. Until an agency or the principals confirm, The Event Record treats “Jisoo and Seo Kang Joon are dating” as unverified speculation.