I quite liked part one when it started, but not impressed by part 2. The 2037 background is not very convincing. It gets quite confusing. Which one is Bum Gyun and Joon Hyuk? The 2 part formula is interesting idea but relation between two parts quite unclear. Now over the half way mark and the title is very appropriate, as I think it is going round in circles and becoming quite a struggle to watch. Towards the end picked up again, more action and story coming together. But what happened? Was she taken back? I think it could have been less episodes. 8.7 rating is around right.

Male lead part 2 quite handsome. Bromance between brothers but otherwise very slight. IMO real bromance is between non-related persons. Not one I would re-watch.