The first half of the film was very very engaging and it was gripping to the core with a parallel kinda story-telling going back&forth, the interval block of the film was very well made and the film should've probably ended up there itself because the 2nd half was just about knowing the backstory of the vengeance and it was nothing special at all.
The problem of the film lies in its sloppy & disengaging screenplay in the 2nd part and the enemy of this film is its BGM since the bgm maker has done a poor job of not scoring any bgm at all and most of the sloppy scenes felt sloppy just because they lacked the bgm, there was literally no bgm at all when it was absolutely required.
This is a unique film where if you just watch the first half and walk out, you'll certainly feel like having watched a full movie and if you sit & watch the 2nd half, you'll regret not doing what I said earlier.