I watched this because of Zhang Ruoyun and while it really wasn't the greatest, it was easy to watch.
The characters were definitely the best part of the show, but beyond their relationship with each other, none of them were very well developed (other than Qin Ming). I wish, since the murders weren't all that interesting and incredibly easy to predict, that the show had spent more time with the characters and that we got to see more of them beyond them working together.
I also think this show could've benefited from developing the overarching plot. I actually liked this plot point, but it should've been hinted at more throughout the show (other than the mention of missing molars) and I wish that the killer's reason for framing Qin was better. Also, mini rant here, but it was fairly obvious who the molar killer was and that disappointed me a bit too. I think part of the problem is that in a murder mystery the killer has to be someone the audience has met already and since the characters don't do much other than work and go to eat, it was clear that the killer was someone who worked at the restaurant because obviously it wasn't going to be one of the cops.
But yeah, I would watch if you enjoy gruesome murders and like one of the actors.