From what I observed, I think Seohyun was looking at Minho’s direction, her eyes was trying to see at the other side. She didn’t see Suho until some time later, you can see she seems to have her eyes on someone. And then Minho comes in view, he was looking straight at first but turns his head to Seohyun when she wasn’t looking😀💕 This is a cheap moment, very cheap moment of MinSeo btw, lol more like a SeoHo moment😆