Inspector Koo is a Korean detective drama with a single storyline. Koo Kyung-yi (Lee Young-ae) is a former police detective who now plays MMO RPGs all the time. Her friend Na Je-hee (Kwak Sun-young), head of an insurance company investigative team, hires Koo as a consultant to investigate a life insurance claim to see if the death was a suicide or not. Instead Koo finds a series of mysterious deaths and starts suspecting a serial killer.

Meanwhile college student Song Yi-kyung (Kim Hye-jun) and her friend Geon-wook (Lee Hong-nae) are busy having fun punishing evil people by arranging clever accidental deaths for them. And later on we learn that Song and Koo met each other on a previous case and perhaps Koo set Song on her murderous path...

This is a 12-episode hour-long drama. It's a bit like Death Note where there is a team trying to find out who the serial killer is but they don't want to accidentally reveal themselves to the killer. There are a couple of plot changes and twists to extend the series, otherwise I feel it could have wrapped up a good story in 6 to 8 episodes.

Still, I did like all 12 episodes. Koo is an interesting character, kind of a Sherlock Holmes who notices everything and is blunt to everyone. I guess that make's Na's team her Watson. Na is the team lead and responsible one. Oh Kyung-soo (Cho Hyun-chul) is the hardworking investigator but lacks imagination. Santa (Baek Sung-chul) is one of Koo's MMO RPG clan mates hired as her assistant and he never talks and is dedicated to Koo and that is a mystery that is never really answered (or maybe it is but it's hard to trust Song on that point).

There is a setup for a second season and I would watch it.