This show certainly keeps you on your toes. It's fast paced, unpredictable, and exciting. Very bingeable. Some of the 10 "resetters," who start getting killed off after they travel back in time one year to fix their lives, are just cannon fodder, but the majority of characters still manage to make an impression even when the busy plot doesn't leave a ton of time for character development. Deceptively crazy Se Rin was my favorite, loved her. The actual time travel element of the plot was underwhelming though. 90% of this just feels like a regular murder mystery, the time travel shaped the plot less than I expected and we spend too little time learning about how time travel works in this universe.