Started watching Marriage Contract as a filler in between Reborn Rich and Summer Strike episodes.
I'll start with the negatives!
1. Lee Seo Jin's character's family on his father's side are THE WORST!! I just wanted someone to kick the dad and brother in the nuts!
2. BMW badges are missing for half the series. Nitpicking here, but it's probably the easiest car brand to identify.

OK, now that's out of the way - on to the positives. This was a rollercoaster of emotions and if you like that kind of thing, then please watch it. I does have a bit of a daytime soap feel but unlike something like Young Lady and Gentleman, it's only 16 episodes and the production value stays consistent throughout.
The real stand out was the girl who plays the daughter, Eun Sung - an incredible actor. I was really impressed with Uee and having not watched anything with her or Lee Seo Jin before, I'd be tempted to watch some of their other work following this.
The main characters have a real developmental arc which makes you get sucked into the emotions and really feel for our leed, Uee. Like I said if you like that (and getting your heart ripped out and put back again) then watch this drama. I stuck it on 1.5x speed and binged it in a few days.