I don't know the ones you mentioned but the Can We Get Married? was pretty good if I remembered right, though that was like the process to get married. I remember it being very slow but I also remember liking it a lot.
Fated to Love You is a funny story. I didn't like it towards the end and haven't finished it yet, but some of it was pretty fun.
Also the Reply series (at least the ones I've watched) tends to focus on the married relationships as well.
The Lover might be an interesting anti-series for you. It's about couples living together but who aren't married, so it has that level of commitment and struggle but without the actually being married aspect part. I thought it was a pretty interesting series.
That's all the dramas I can think of, though I'm not sure if they're exactly what you're looking for.