I really enjoyed this. I was a little worried it might be stodgy or hard to follow for someone ignorant of Korean history but that wasn't the case at all. Lee Je Hoon was excellent as usual, I always appreciate his range, intensity, and charisma. His Unit 1 colleagues aren't deep characters but I enjoyed their camaraderie with each other. It was interesting how in most of the episodes the mystery wasn't "who's the perpetrator" but rather "how will we bring the perpetrator to justice given the constraints we're working under." The characters come up with smart workarounds to the municipal corruption that stymied legitimate police work at the time, such as forming strategic allegiances with beggars, staging rogue undercover operations, and tricking a gangster into attacking an American soldier which changed the jurisdiction of the case. I wasn't totally on board with how the show dispatched it's multi-episode villains (quickly and anti-climatically) but I was consistently pleased with how they resolved the cases of the week. The romance subplot was really nice as well, they were such a sweet couple.