This is my favorite trope, so I have to say while they aren't that popular in Korea, you can find them a lot in different daily dramas, weekend dramas, that sort of thing. For example,My Daughter Seo Young, Unexpected You are just a few examples.
Right now I'm watching Marriage Contract with Uee, but the marriage is a hidden one, and there's also 1% of Anything, in which couple gets married about halfway? through show.
For non Korean shows, Thailand has a lot of them featuring arranged marriages, contract marriages, etc. I just finished Padiwaradda which was all about marriage and what makes the best wife and so on.