I loved this. It easily made my top 10 k-dramas list.

The story was clean and simple, with only one modest trope that I could find - and even that worked, in fact it was essential, to the overall story. The characters were real, human, and beautifully drawn - with the story giving each space to breathe. The story explored grief, guilt (including survivor guilt), PTSD, and found families.

The acting was very, very good - particularly from Lee Jun-ho (outstanding, actually, particularly as acting isn't his day job), Kang Han-na, Yoon Se-ah, and Kim Kang-hyun.

I'm slightly - just slightly - conflicted about the ending. Would it have been slightly better if what appeared to be the arc for one character followed what appeared to be its trajectory? Maybe. But overall a wonderful drama.