i just rewatched the end and siwon's mum asks him: 'are you seeing anyone?' and junhee says no. the mum goes on to say he should meet a nice girl unlike siwon because if not, he'd end up like yunjae. so it's still all very open ended because he could be saying no because they're just casually dating but junhee deserves a nice, stable boyfriend who will do the dishes and kiss him sweetly ;;