The good:
. the acting of the cast. I think they performed well, convincing acting on everyone's part.
. exciting in the first perhaps 12 episodes. I binge-watched the first 10 episodes. It was exciting wanting to understand this entire time loop, to know what happened each time after the main leads woke up because things were always different after each loop and how they were gonna prevent the explosion.

The bad (just my honest opinion, that's all):
. as I mentioned I was hooked only until about episode 12, then I started to feel a little bored, the time loop was enough, well, perhaps because I do not watch a lot of time loop dramas in the first place, but the repetition was too much, the bus scene repeated and repeated, I was tired of it, I wanted to get off the bus.
As one person mentioned, the entire drama could have been condensed to a movie, rather than a 15-episode drama because there were some unnecessary scenes which did not help in moving the story. Well, to me, it was not necessary to condense to a movie, but shortening the drama could have helped perhaps.
. well, this is just my opinion, I did not really like the male lead, he looked fragile and sickly to me, this is merely my opinion, but his acting was good.
. this is not really a bad point, just an observation. I did not understand why the Chinese police had to deploy as many as 5 police cars just to pick the female lead, a vulnerable young girl, up for assistance in the bus explosion case, even if they think she may be armed, but 5 police cars to 'arrest' just one young girl? And in that scene, they were not going to arrest her, just inviting her to go to the police station for some assistance and questioning.