@IsabelinaD - I can't tell if that's KJW, it might be, might not.. unless someone can find that original picture showing the full face of the girl he took the pic with? I wouldn't freak out though! To me I've always thought Minho thinks of KJW as a dongsaeng only.. she's a 1992-er and he's 5 years older than her. As we all know, the Heirs cast was like a family when they were filming, they all became very close. It's nothing to worry about.
We can also think about how after a certain point in the drama, they didn't have many scenes together anymore. I bet they didn't have too much interaction on set because they filmed at different times. She had more scenes with KWB and KHN.
And just because we didn't see any selca of uri Minshin together, doesn't mean they didn't take any! We've discussed how it's strange Shinhye only posted one of their selcas at the beginning of filming.. she definitely deliberately didn't post them as to not stir up any rumors. I believe she was being cautious, and rightfully so. I mean, look what happened when their rumors made the headlines.