The story had great potential and was very intriguing at times. The overall connection and ties that each character had with one another were some of the highlights in the show. That being said the first 10-14 episodes were very in-depth and detail-oriented almost warning to pay attention to every detail or you will miss something. This caused you to believe that the way that the villain will be stopped would be incredibly intricate and hard to follow. Unfortunately, the ending wasn't so. It was very clear that the way that the day would be saved was through the usage of a helping hand from the future and past. The emphasis placed on the villain just needing someone to check on him made it obvious that this was going to play a role in defeating him. And though the ending with Eddy and Han Tae-sul killing himself was shocking, it wasn't a good ending because it seemed rushed and unnecessary. It felt as though if he was going to kill himself to save the day he should have done it from the beginning. They wanted to push the agenda that it was his love for her that caused him in the end to sacrifice himself but it felt cliche and uncalled for.

Edit: Let's talk about the ending. After he shoots himself he returns onto the plane from the beginning of the show which was 2020, and the FL is sitting right next to him. Now, unless it was a dream or hallucination, that makes no sense. the FL said she was born in 2012, making her 8 years old in 2020.

The overall show was pretty good but due to the ending, it is unfortunately turned into a decent show at best.