ok so this is my first drama of both main leads and i mainly watched for the plot that many had raved to me about. this drama is definitely worth my time binge watching it! i've been a fan of this particular genre with relations to mystery and time travelling related stuff so this is def one drama i would enjoy. for the casting, i think it's pretty okay. however, im not sure if its because i watched this drama when its already finished but i kept skipping many scenes that i found "boring/unneccessary" as i was more intrigued with the ending lol. if you enjoyed this drama, i would def recommend to you "derailment"which is a drama related to time travelling but it isn't recurring time travel like this drama.