Do I Recommend? Yes
Will you hate me for it? Yes
Will you regret watching the show? Yes

The show is not a masterpiece. At times it lacks some excitement that was promised. It's dull for half of the episodes of the show. When it does pick up it feels rushed since it doesn't truly pick up until the last few episodes. It has a lot of boring political stuff that has nothing to do with the plot or isn't important enough. Many of the storylines aren't relevant.
Although most of the time it is boring, you just can't stop watching because of some of the characters. Especially the adoptive father. Episode 14 can go to hell for making me cry like a little girl. Some episodes will make you angry or really sad or just plain depressed. Honestly, I don't regret watching iljimae but that ending did all of us who dedicated our time to watch it, dirty. No one truly had a happy ending. Just a somewhat okay ending for all involved. It felt rushed.
All in all, I don't regret watching it and I truly do recommend it but you will hate yourself and me when you finish it.
It's worth it though.