I'm a fan of Kim Ha Neul and Yoon Sang Hyun so that is why I started watching. Most of the dramas I watch are before 2018 because I'm not into the zoomer ones like the ones on netflix. Getting straight to the point, the first 4 episodes were S tier. The next 12 episodes were snoozers for me because I have a short attention span so I need every second to matter in a drama. The main problem in this drama is that there are too many scenes that are replays and too many sleeper flashbacks.
The acting in this drama was really good because Lee Do Hyun did an outstanding job in the first couple of episodes and the other two main are veteran actors. But there were still scenes where you would cringe because how cheesy the acting is.
The story in this drama had good potential but after the 4th episode, the plot watered down really hard. But I was never bored when watching the drama. I usually don't finish dramas if they get too sleeper but I finished this one.
Overall a decent drama that I wouldn't watch again. Although the quality of the drama is good, I just cannot rate it higher than a 7.8 because too many replays and slow motions that make me angry. And the underwhelming 12 episodes.

EDIT: I'm currently watching this again with my mom and I realized that I haven't really appreciated the acting, small details, and the music very much. Story is still quite underwhelming but the acting and comedy makes up for it. The fact that I am also re watching this is also proof that this drama is a fun experience overall. I can proudly say that this is an 8.5 worthy drama and is a good watch for anyone especially if you are a father.