Starting this show, you will be left a little confused, but it progresses very fast, making the show very binge-worthy. However, even after watching everything, I feel like the character development is very poor, not taking into account the last episodes, it is almost non-existent. The character shares some valuable insights in the meaning of life and why we should always try, bur at some point it got very repetitive and death's arrogant personality did not make it a lot better. What I was hoping for was a little bit more character development, although it seemed like the Choi Yeejin learned his lesson, he did not really seem to progress and that made me very frustrated.

Apart from that, it is quite a masterpiece, seeing how the story gets clearer and clearer with every episode, therefore I highly recommend to watch it, especially if you like mystery!