Finished watching all 16 episodes of Korea's Possessed on Netflix. A detective with a traumatic past and a psychic who works in a dress shop team up to track down the ghost of a serial killer executed 20 years ago but whose spirit now possesses someone to continue his grisly murders. The problem with this formula, of course, is that the villain never undergoes any kind of dramatic change (they either just die or get punished), so that one wonders why many actors consider villain roles as juicy ones. 

Suspenseful, but there are many moments of comic relief due to the idiosyncrasies of the characters and, as in other Korean movies, the romantic scenes have the best treatment and dialogue. Having said that, I couldn't watch more than two episodes in one sitting because of the multiple murder scenes. As a matter of fact a disclaimer at the beginning of Episodes 5, 12, 15. and 16 even assures the viewers that the child actor's role did not affect his mental health and that he continues to receive monitoring and support. Episodes 11 and 14, to me, were especially sadistic.

Not for the faint-hearted, but Strangers from Hell still takes the cake for me. The ending of Possessed,  however, is diffused, anticlimactic, and, after all those deaths, wanting for proper catharsis. Finally, one cannot help but question the overall morality of the movie, since its premise includes the dissipation of souls and the possibility that even the gods have no control over evil.  

By the way, the reason you cannot learn Korean by watching Korean movies is this: the subtitles are never literal translations. The upside always is, when we are watching Korean thrillers, we realize with great gratitude that we are living safe and simple lives compared to all those characters.