The show is dragged out way too long at 16 episodes, especially with all the interesting plot points that are wasted and goes nowhere and terrible ones that go on for ever. Kim Jung Hyun is doing a herculean job trying his best to act his way through this atrocious writing for Kokdu the character who has grown petty whims and tantrums during his long supernatural punishment after losing his memory or original personality to time. The worst part of his character is still anything to do with the forced romance between him and Gye Joel, both before and after they fall for each other. There's no spark between these two characters, it's just double the annoying scenes. There is no proper communication for most of the series either, with important information force revealed to one or both of them. His curse/promise to do literally anything she asks being used for comedic effect falls extremely flat to say the least and it cuts short the fascinating aspect of the other curse from the deity for him to hear the cries of victims to kill a specific person. He's shown to kill the scum of the earth that evade legal persecution, but he's also shown to hear the calls for the death of someone that's just based on made up hearsay by Gye Joel who he may more may not have killed if it wasn't the body he was currently occupying. He really is a serial killer with voices in his head telling him to kill and the plot where Gye Jeol's brother detective Han Chul tracks him down is way more interesting than romance storyline. There's also the storyline point where Kokdu's power was on the fritz and suddenly that's forgotten about and it was just fine. The part where he found the reincarnation of his younger brother who turns out to be ex-boyfriend Yi Deun who brutally dumped Gye Jeol albeit with a reason, was more exciting than anything with her. I wanted to see their new brotherly relationship explored more. More of Kokdu's original personality is scene in from the past with their reunion. It was actually sad seeing Kokdu's pain at being unable to protect Yi Deun from getting shanked whereas there is no feeling or stakes with anything between Kokdu and Gye Jeol. Unlike her Kokdu actually has his sentient moments and sees through people and makes interesting plans. It was clever of him to use his own end time in the mortal realm to set up his enemy as a murderer. Again it was a frustratingly dumb moment to see Gye Jeol just crying instead of using any of her ER doctor skills to even attempt to help him. She suddenly just wants to kill the guy like she's possessed by her past life instead of sticking to her morals about not killing.

Do Jin Woo's character feels like a wasted opportunity. He was trying to expose corruption and the killing of his birth mom before he was surreptitiously murdered and his corpse possessed by a supernatural entity. He's really sharp and immediately figured out the supernatural situation he's in and wants to live. Exploring the dichotomy between doing what's right and playing it safe to live longer while going against both the earthly forces pursuing him as well as Kokdu could have been interesting, but the show dropped it like a hot potato. It's such a relief to see his level headedness shut down and not enable Gye Jeol's ridiculously childish behavior. It would have been fascinating to see his story play out, but instead he just dies again at the end of his 49 days after death.

The biggest weak point is both the writing and acting for the female lead character Gye Joel who pretty unsufferable the entire time. There was a moment of hope when she stood up for herself to block one hit from an unreasonable patient, the first and last point I wanted to root for her, but then it's just a series of her being a clumsy, man obsessed, childish, whiny, immature overreactions to everything, literally tripping over her own feet charicature. She literally trips down the stairs multiple times. The worst part is the drama points this out as a point of pride, she's intentionally made this way because they think it's cute. It's not. The worst is that she can never advocate for herself or for her patients. There is no point to her as a doctor characer. She does use her status as a doctor to threaten her brother to sabotage the witness's testimony if he ever brings witness who saw her boyfriend murder someone to trial. She's always the fool. Again the drama does it on purpose like they are doing something great. The acting doesn't do anything to elevate this kind of grating character. She's comparatively fine as Seol Hui who for the most part is allowed to act like a human being, actively taking agency for herself her entire life , but as the reincarnation of the character she drags down the story every time she appears and she half of the lead pairing. She's a pretty awful doctor too, not questioning how Do Jin Woo who is severely injured by falling off a whole highrise onto a car is just fine with some amnesia, taking advantage of an amnesiac to lie for her in a hearing, telling people she's his accomplished doctor boyfriend, the extremely irresponsible way she treats Do Jin Woo even though she thought Kokdu personality was a result of a disorder, etc. She doesn't notice all the weird powers he has, even when it's shown to her face while she believes things she has no proof for. She doesn't figure it out for TWELVE out of the 16 episodes when he literally had to teleport her and heal in front of her face. She some how managed to become a doctor, but her brother detective Han Chul got the brains of the family even though he supposedly has double digit IQ. Her forcing him to not take bigger cases is pretty selfish too, it's his job to investigate. Ahn Woo Yeon as Han Chul carries all the sibling scenes they have together and Han Chul can be professional at his job, but she can't handle it. Gye Jeol's must be in the negatives. His romance storyline is leagues better and more mature than hers as well, the difference better acting and strangely better writing as well. The writing lampshades her terrible traits, but that's not the same as breaking through them.

The costuming is also very garish for all the characters from lead to supporting. They literally give Han Chul a leather jacket with spikes during the scene he first meets Kokdu as his sister's boyfriend. It would be fine if it looked cool, how did they manage to find the worst cheap looking one. There are so many lower budget productions that do better in dressing the characters both for the story and just aesthetic wise. All of the jewlery looks so fake like toys except for the bog laurel ring and hair stick. The pink jeweled tiara and the matching necklace are the worst after the big ruby ring. It makes no sense because Ok Shin chaebol underling is filthy rich and could afford real jewels for her.

There is one thing the series surprisingly does right and that's actually planting the seeds for a plausible reason for the disappeared forever character to reappear again. Kokdu had his contract with Gye Jeol and also the prayers from her kokdu cult of patients that she makes pray for him in lieu of payment. Kokdu remains a entity with his underworld job and Gye Jeol continues her cycle of death and rebirth without the tragic death in this timeline like she has in every life. They just dropped that nugget last second without having established that info anytime in the 16 episodes. It's also a bummer there's no final reunion between Yi Deun who survived the stabbings but no line about whether he's in remission or not which he hopefully is after five years.

If you skipped to the end here, just skip this whole drama. There's better ones out there.