Yeah unfortunately switching is such a rarity. EVen tho that's literally my favorite dynamic for every couple I ship I stopped hoping for it in manwhas and especially for main couples (it might happen for side couples). I think authors atp are just afraid of committing to it too because trad fujos are sensitive af about the order of a ship so yeah we can only dream.
Once they get together I believe Nanjo will want to apologize to Sunwha with Mok and I can just imagine the awkwardness of the scene lol but in the end I hope that Mok and Sunwha will stay friends, tho without the benefits for good loool
Besides Mok's jealousy, I can't see Nanjo being involved with Sunwha ever again because Sunwha never liked him and they cheated on each other... Better forget it and move on

What a waisted opportunity of making them switch smh