You don't have to watch the first season as they do recap it in the first episode but it's better to watch it as you understand the background of how the male lead got his name 'Poong' and the situation of the female lead. Also the circumstances in which he started working in the clinic. Also the last episode will make more sense if you've seen the first season.

The second season was quite enjoyable for me. There was more focus on psychiatry in the second season which was one of my biggest complaints with the first season. I personally enjoyed this season more. Though there was some good mystery in the previous season as well. Don't be turned off by the SFL as her part is not much. But the SML can be annoying. The thing that bothered me is why Man Bok's character was not properly used. It didn't make sense.

There is more romance in this season but don't expect too much. Most of the time it is just awkwardness and spending time with each other.

If not for the finale, I would rate it as 8.5 because I was entertained. The final episode was underwhelming. Missed opportunity of cashing in on the couple that everyone wanted to see more of. It was overall sweet. Just missing some bang or maybe that's how I usually expect finales to go.

I actually didn't think I would even watch the second season after the first but I'm glad I did.