I don't know how people are saying that they've completed all 12 episodes when there are only 10 episodes broadcasted till today.

Anyhow, I don't understand the high rating. This show has so much wasted potential. It could have been a mindf**k show with the time travel theme, it could have been the exploration of parent-child relationships, it could have been a show about an elaborate fraud scheme, it could have been a super-hero show, or it could been about mental health and healing. Or it could have been about an epic love story. Even Jang Ki Young was a disappointment if I was wanting to watch an 'idol' drama.

It has been NONE of these. At most I would class it as a somewhat interesting love story, sans romance. I keep watching and waiting for any one of these to emerge, but none has. The only reason I'm continuing is because I just want to see how bad it is at the end.