Personally I think the pacing is a bit off around the mid-point of the story onwards. Many issues and topics are brought up and then pushed aside to the point it confuses the reader when it's brought up again much later. I dropped around Chapter 140, but give it a read yourself. I found it a bit boring and it didn't make good use of certain arcs (Murim Arc, etc).
Since this has 105 chapters of the main story, can someone spoil for me which chapter it starts to get angsty please. Thank you