Maybe this series suffers from the difficult birth it had, with a slow start in production. I think that its origin as a webtoon does show in the characterisation of the lead actors and the way in which the dialogue has a "comic book" quality. It did take me a while to get used to that but it the end it doesn't seem to matter.
The two lead actors, Byeon Woo-seok and Kim Hye-yoon quite simply acted their socks off and all the cast were directed to blend in together admirably. I did struggle a bit with the time slipping which was a necessary part of the story but as an older citizen, I just accepted that I didn't need to know what date it was in every scene and just sit back and enjoy it.
My family has been touched by suicide, related to that of Korean pop idols and I wanted to let your cast and production team know that the storyline is all good as far as I am concerned. Conversations about suicide are always helpful and are not disrespectful.