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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 !

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.

I really need someone to explain to me what happened in the last episode especially the last 15 minutes!!!! 😭😭 I loved the mystery that was found in the drama, but can't give it 10 stars because I didn't understand anything literally 😭😭😭

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.

This is clearly a well-budgeted and well-made show.

However, I was left feeling out of place with it constantly. Maybe it's my fault - I did watch it sporadically so I kept having to catch up with the thread of the story.

Nevertheless I just didn't connect with it and didn't feel the sense of danger that (I presume) I was supposed to feel.

The acting is fine and it's full of nice shots and cinematography. But it all felt very clinical - even with the subtitles (I find dubbing often puts me off) and left me baffled why I should care.

A complex story really needs to get you involved and this one doesn't. So you're left with no reason to invest the time. However, I did manage to watch the entire show, but the final episodes felt more like a duty than a fun.

If they do a second series I may give it a try... there are the seeds of a good show in there.