This Korean series is centred on Kim Do-gi, a Seoul taxi driver. He is a former special forces soldier whose mother was murdered several years before; the killer died in prison but our protagonist is still left with a desire for revenge... it turns out that a small group within the taxi company, including its owner, is helping others get revenge on those who wronged them and got insufficient punishment. Over the course of the series they help several people seeking revenge; these include a woman whose 'employers' were treating people like slaves and an internet hosting company that has a bullying culture. Those they 'arrest' are taken to a 'prison' run by female crime boss Baek Sung-mi. Prosecutor Kang Ha-na has noticed the disappearance of several criminals and starts investigating; she soon suspects the involvement of the taxi company but finding evidence isn't easy.
I thought this series was really good. The central story was really good; while most viewers will get behind the revenge seeking taxi firm it doesn't shy away from raising questions about the morality of their extrajudicial actions... especially when we see how those they take to their prison are treated. Before each arrest the group investigates the 'accused'; these tend to expose some disturbing practices which make uncomfortable viewing at times. There is a decent amount of action; these scenes are exciting and well-choreographed. While this is by no means a comedy there are some fun amusing moments. The cast is solid; most obviously Lee Je-hoon as Kim Do-gi, Esom as Kang Ha-na and Kim Eui-sung as taxi company boss Jang Sung-chul. Overall I'd definitely recommend this to fans of Korean dramas.
These comments are based on watching the series in Korean with English subtitles.