Korean film has been pretty tough on its homeland. Much non-romantic lore of late handles mishandled or downright criminal police procedure or judiciary mistakes, and/or rape and abuse based on true stories. Other than the impeccable technical credits one has gotten used to in Korean film, most of these films impress by a story-driven writing that has become somewhat lost in Western film, where drama tends to involve more of the individual actor's abilities of expression - that makes them sometimes a little emotionally overwrought to Western viewers; examples for this may be 'Way back home' (2013) or 'Sea Fog' (2014), which are very good films but sometimes overdo things a bit.
'Han Gong-ju' is different. It focuses almost entirely on its principal character, played with outstanding reservation by Chun Woo-hee. The story jumps unpredictably back- and forwards, making it initially quite hard for the viewer to follow. But what may seem a weakness is actually the film's greatest strength, because the viewer is left with no choice but to follow the events through Gong-ju's own eyes - therefore the ugly truth, once revealed, hits twice as hard as it normally would because the various tensions in the plot are allowed to build up slowly. The only weakness in my opinion is the actual scene of the crime, which could have been edited more respectfully, but then again this is a graphic age we're living in.
In short, this is an exceptional character-driven piece about the most difficult subject of all to handle in film. A must for any serious cineast, but not for the faint of heart.