I just finished episode 5. If you are wondering if you should watch this, the unequivocal answer is YES! It's going to tug at your heartstrings, in a VERY big way, but I can't even state in words how much I love this drama. 10+ stars!
I just finished the second episode, and I'm REALLY disturbed at what happened to Nam Jung Hae when she was drinking in that lounge. This drama, so far, is just too dark and too depressing to continue.