I'm surprised that this has a really low rating. The story was really solid, maybe not as solid as Signal, but it definitely is at the upper tier. Some say the first half of the drama was really slow. It maybe was, however, I liked how the foundations of their love was laid at the first half. It seemed like a romance series sans sci-fi because it showed the typical married life. It maybe dull for some but I could definitely see my parents in them. Also, sex was quite a taboo in some series, so I liked it how they tackled that issue here. The second half was where the rising action came in. The first half made a good foundation on why both of them were willing to do what they did. Not just both of them, but most of them. Most of the character developments were displayed really well, though some of them were a miss. Nonetheless, they played very minor roles so they did not exactly affect the plot that much. The second half was really fast, in a good way. The episodes transitioned seamlessly that I did not notice that it was coming to an end. I felt like the finale could have done better because the intensity from the previous episodes fell too fast. It was satisfying, though. I get to see a half hour of them together, so none of that sad love. I actually watched it because of Lee Je Hoon (been following him after Signal) so I was surprised that I liked Shin Min Ah here. Both of them had great chemistry that, like I already said, it felt like I was watching a real couple. They were really cute. All the other characters were great as well though the chemistry between So-joon and Ki-doong were more of a brotherly/bff type than the bromance they were pushing for. Overall, it was a really great romance series, like a breath of fresh air so it's quite surprising that it's just 8.2 because it deserves more than that. It maybe because it's a little too heavy for some people (I regretted watching it but I was already hooked) and its target audience are adults/mature so it's pretty limited. It doesn't take away its greatness. Goes to show that some gems are not appreciated by most people.