Close to perfect. I wonder why I always hesitated to watch this before. Amazing plot, various character developments, good comedy, great acting, cool action scenes, and exciting suspension. Nothing is a bit unnecessary for me, but the shortcoming was maybe at the first episode it was a bit slow, but it keeps getting better on each next episode. I love how it focuses not only on the priest or the prosecutor but also on other supporting roles' character development like Jang Ryeong and Ssongsak. Having the main character as a priest makes it more interesting than most of the same drama in this genre. In the end, the main idea of people repenting their sins feels align with the purpose of the priest himself. It makes me emotionally attached to each character. When it's characterized and comedy-crime, it doesn't lack the thrill when the action came in. Props to Kim Namgil for his great acting. But what I truly love the most is their good chemistry and how their relationship evolved from some stranger, some enemy, some acquaintance, to become one as family. Everything is beautiful and well-written.

Ps: I love how some sad and heart-breaking scenes not really using sad ost that makes you cry but rather they use the upbeat scores that make you feel furious and want to get revenge on those villains while watching it. It doesn't feel like I have to cry every time.