Based on how the drama has been portraying I think the most likely ones to happen are:
Ikjun x Songhwa
Seokhyung x Min Ha
Also, Jun Wan x Iksun got together so fast I am afraid the writers will end up splitting them apart, especially with how Iksun doesn't wanna get married (which is completely understandable) and she wants to focus on her career (understandable too, you do you girl!)
As for Gyeo Wool x Jungwon... I am not sure, imo Jungwon hasn't really shown any signs of having actual romantic feelings for her, he mostly acts awkward/uncomfortable with her. And tbh as much as I like Jungwon, I think Gyeo Wool deserves someone who actually treats her better as a woman.
I have seen some speculations for Chi Hong x Sun Bin (the NS resident that once covered his shift for him in order to help him rest). I think I would like that, because if Ikjun and Songhwa really were to happen, I hope Chi Hong can get some love too :')
Now, one of my favorites would be Rosa x Jong Su xD They have been friends for so long and now that both of their partners died, I think the comfort they bring to each other is just so cute.
Now I know this totally won't happen but if the speculations about Jungwon possibly being gay and Junwan having to split with Iksun... I think Jungwon x Junwan's chemistry is really nice XD But that's just me and my fantasies.