It started off really well and was good until the end but then it became just flashbacks and fillers. Also the killer became very predictable by the end and was not impactful at all. For some reason I started to feel cringe watching the ending episodes.
https://www.asianjunkie.com/2018/02/11/lee-jin-wooks-accuser-sentenced-after-overturn-on-appeal-that-used-rather-odd-reasoning/
Btw I agree with your last statement