Believer (2018)

There is a particular atmosphere, very dark. There is a really good twist and an open ending. And the duality between the two leads is well used to buid the story.

Both productions tell the story of undercover policemen and criminals trying to trick each other and prevail

believer 2 is the second part of this movie so if you like Believer then can also watch Believer 2
you will know more about the story of this movie s

-Both have Ryu Joon Yeol
-psychopaths
-undercover theme
-hidden identity
-did I mention they both have Ryu Joon Yeol
-both movies we need sequels of

They both have a similar plotline of betrayal at the end. Both have an overarching villain trying to be arrested and the detective in charge seeking help from unexpected avenues.