The story line goes back and forth way too much that failed to deliver any kind of development. Everything happened in ep 22-24. As much as I am a fan of crime dramas this lacked the mystery and the progression that any good script requires. Burning Ice (2017) to me is still the gold standard for mystery with captivating characters.

The only outstanding character to me was actually the wife of the young cop, a supporting character. The MLs:

1. The old cop's character was all around frustrating. He lacked any sensibility, discriminating against a suspect that should've clearly been ruled out ultimately indirectly caused the tragedy that followed.

2. The young cop (who I actually watched the drama for) was the only character that had any crime solving brains. He made connections where as the old cop to me made zero progress. I didn't even see the point why they needed the old cop other than he was on the case 13 years ago and provided flash back minutes. Still I felt the character was rather bland until last 2 ep.

If you think about the critical developments were:
1. (NOT a cop) that provided the origins of a painting
2. DNA technology improvement
3. Key Witness (memory coming back)

Not much to do with actual detective work.