The show was too short in length/episode and the number of total episodes.

There is a story to be told that spans the past and the present, but there is not enough time to explore it completely.

Why was Dennis so obsessive? Why was he in the present? Did he have a history with Yudam in the past - or was he just an assassin for hire? Did he have a romantic relationship with him? Why was he so adamant that Yudam would use and throw away Seol Dongbaek?

There is a parallel between the Seol Dongbaeks deaths - It seems like he is shot and stabbed in the same place. I wish the past and presents of Dongbaek and Yudam were more fleshed out.

Yes, this has a sort of open-ended happy ending, but it isn't really satisfying. I feel like there was too much covered, but it was all just on the surface. There was no depth.

This has so much potential. And it was all wasted.