Story: Especially at the beginning, some parts of the story are being thrown at you, but it does get better throughout. Honestly, some parts were confusing, mainly because they introduce characters by name before you see what the character looks like or their personality (but could also be translation errors). The dynamics between the characters are very well-written, and although some misunderstandings change the course of their relationship they end up working it out eventually. Also made me realize how psychologically torturing being an assassin is.

Acting: Exceptional especially for the antagonist and protagonist but honestly every actor/actress did amazing, including the parts where the characters are desperate and suffering. You can feel the emotion in their voice. Even when there isn't anything verbal going on. In particular, the main characters' facial expressions and how they move still give the scene weight to it.

Music: A lot of the OST music I would listen to on repeat, particularly the intro song. And I know a lot of people love it for the same reasons I do. It fits the relationships between the characters in the story and the cadence of the singer really describes the emotion of the song. They do milk it a lot in the episodes but it is a moving song so, it's not as annoying as you would think..

Rewatch: I generally don't rewatch shows unless they are amazing shows/mystery genre. I feel like this show is a one-and-done situation, but I did enjoy it while it lasted.

TLDR; Story is a bit confusing at first but it flows throughout the show. Acting is phenomenal and is amazing a portraying emotion even when they aren't talking. Music is beautiful and melancholy. Most likely won't rewatch it, but it was an interesting experience.