Changbin calls Guest while she is working, which is unusual for him. From what he says, it seems he told his friends he got a girlfriend, and they dragged him to a bar, saying they'd bring their own girlfriends and that he must bring his right now.

Everyone else is bringing their girlfriends... Noona, is there any way you can come?

His voice is a bit lower than usual, as if he feels guilty for calling her while she's at work.