Jisoo and Seo In-guk prove they have just as much chemistry off-screen as they do in “Boyfriend On Demand” by putting their friendship to the test with this costar quiz! Do they know each other's love languages? How about their fave BLACKPINK songs? Watch it all now on BuzzFeed Celeb YouTube! #Jisoo #SeoInGuk #BoyfriendOnDemand #BLACKPINK #Kdrama