I started this show for 2 reasons: Gong Seung Yeon, and the advertised concept of a show about the emergency services working together. GSY was great (and so was Ji Woo), but the premise turned out to be a lie.
Instead of a show about the 3 services working together, we got a show about one 'rogue' detective using the fire and paramedic services as his personal investigative lackeys. Openly derisive of the value of their work from the start of episode 1, he did everything. Which is just as well, because EVERY episode of the 4 I watched turned into an investigation for the police. Not what was advertised and not what I signed up for.

The other BIG problem I had was with the "Big Bad". I am not a fan of multi-season shows, and when I saw the "Big Bad" in this first series, I rolled my eyes. Sure enough, I see he's in S2 as well, and that was the kiss of death for me as far as my watching this show went.

That's a bit of a shame, because KRW was doing well in his role, and it was great seeing SHJ and GSY together. Had the show actually BEEN about collaboration, perhaps with each emergency service taking the lead in different episodes, and had the writers not stuck on a superfluous "Big Bad", it could have been a fun watch.