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Only saw one ep for now-but wow--superb wish uk did drama like this instead of reality rubbish every night--korea seem to have decent drama every single day-cant wait to watch full series-and of course the next series they have or movie--wish i spoke korean i could watch way more.

THE ENDING EXPLAINED !!! ( A bit spoilers alert )

The ghost and masked man materialize there at the time. While the agents are informed about the existence of the Ghost, the moment they are about to start firing, the two create two force fields and pause the time. The Ghost telepathically speaks with Sae-Byeok and asks whether she came to save Sae-Ha, and the answer becomes pretty self-evident.

After this devastating sequence, we see Eo-Jin dropping Sae-Byeok off at her house and later having a heartfelt conversation with her. He also learns that he had died in an alternate timeline, and Sae-Ha sacrificed himself to save him. Cut to a year later, where we see Sae-Byeok with her kid. Eo-Jin suddenly drops in and urges her to tag along with her. He even knows her daughter's name, which surprises her since they hadn't spoken about the daughter. He mentions that she told him the name, which indicates perhaps Eo-Jin has come there from a different timeline.

While they drive off, the bureau's buildings get engulfed in flames after a flash of blue light hits them. When the two reach a warehouse, the door opens to show Sae-Ha, and the Ghost comes out, and then all of them enter this place. The ending, like any other episode from the season, ends on a cliffhanger. Besides an effort to save herself (since she is connected to Sae-Byeok through ancestry), there is hardly any more conclusion I can gather from the scene.

Explaination is Directly copied and paste from Highonfilm website !

This series was probably 3 episodes too long. The first six/seven episodes flowed nicely, and I felt, were engaging. I felt episodes 8 and 9 were just efforts to extend the story. Still entertaining, but, much less so than the previous episodes. Then you had the last episode...Lord...As others have remarked, the last episode made no sense. I just finished watching it and I am totally confused. The story up until the end was original. As with most Korean movies/series, the acting was great. I deducted stars from my rating for the above reasons. Just go in knowing you will be shaking your head at the ending.

It's got the potential to be the best, but what happened?

The first episode was promising and I expected it to continue doing so but went slow and stagnant for few episodes instead. I know they were up to something, and you can see they're leading up to it...but I guess they got confused on how. I mean the plot was great, acting was awesome, casts got chemistry, and editing was good; but the sequence and flow of events were not confusing which was great but they're rather bland. The timing was off somehow, specially the first few episodes, but it did pick up. But when things picked up during the last episodes, it felt rushed specially compared to the first episodes, but they could have intended for that to happen. I just wish they didn't, just so they could have accomplished a much better suspense in the end.

The dark feel and atmosphere of the show was either good or bad or both, depending on the viewer; mysterious or boring, intellectual or pretentious; but still interesting. But its still a great show despite the botched timing or presentation or division of events. I'm really looking forward for a second season.

If season 2 will happen and it really should, they could bring in more viewers if they make things better than the first season. This could really be huge.

It started with a lousy introduction that was too ambitious on paper and then began to jump between one plot after another until the end. There was a desperate need for a better coherent structure and pacing. The characters were more or less fine but, despite being one of the most important characters, the ghost lacked a better characterization to make her role more impactful. The last 1-2 episodes were fundamentally bad, their main purpose was to lay down a handful of new elements for an imaginary sequel. This is a bad common practice streaming services have been pulling since forever to keep hold of the viewers attention regardless if they were planning for a sequel or not. The only acceptable scenario for such a practice is to have a direct sequel to follow it. Anyway, the drama was very mediocre Sci-Fi with a handful of failures.