This was a great thriller drama with so many mysterious elements like Prosecutor Park Woong Joon's fiance, Yeon Hee, disappearing right before their wedding. Detective Yang Shi On, our FL who has the ability to see ghosts, is shown to be extremely smart even though she spent 6 years in a coma and can't seem to recall any events with Detective Lee Hyung Joon who is later revealed to her boyfriend and also happened to be in a coma but is proclaimed to be dead to the world. Detective Shi On makes a lot of dubious descisions just because ghosts are bothering her like walking to the hill in the middle of the night. She is bold but can get killed easily without plot armors. Detective Cha Gun Woo who happens to be at the right place at the right time always chases after Detective Shi On and ends up saving her but Detective Shi On is always leaving Detective Cha Gun Woo in the dark by not revealing the fact that she can see ghosts (understandable) and how she managed to get in trouble and solved the cases concurrently. Betrayal is also massively emphasized in this drama like how someone like Detective Choi Moo Shik chooses to betray people around him especially detective Detective Cha Gun Woo, Detective Shi On, and Lee Hyung Joon even as if he was being forced by his situations or the superior. Its even get more absurd when Detective Shi On leaves Detective Cha Gun Wo who is in a hospital bed after confessing to him that she needs him to be always with him because she finds out that Detective Lee Hyung Joon is still alive form Detective Cha Gun Woo. I get the fact that since her memories were lost and she spent 6 years in a coma so her memories are still fresh after gaining them back but she didn't have to leave Detective Gun Woo like that who has always been there for her. And with the way the story was flowing, it seems like Detective Shin On would not have ended up with Detective Cha Gun Woo if Detective Lee Hyung Joon didn't decide to pass away to the afterlife. I feel like the writer's purposely killed Detective Lee Hyung Joon as he was not the ML but an obstruction to the ML romance with FL. The writer making those kinds of decisions ruins the plot because why bring the dead to alive [in a coma] when you are going to kill him again? But I did like how the writer chose to correspond the last episode to the very episode which was very interesting.