I started watching this after accidentally seeing one of the short video. Initially when I started i wasn't having much of an expectation, but after watching the 4 episodes I can say that THIS ONE IS A MUST WATCH. Story wise it hasn't progressed much as its only on the 4th episode now. But we could actually feel that yes, there is space for growth. There is a bit of mystery and a lot of fun for 4 episodes. The mother - daughter duo is really cool. And the fellow officers are good.
When it comes to casting, I think Park Sung-hoon as Eun Jae-won is overall a different experience. Its a complete 180° turn from what we have seen in his previous drama.
Jeon Hye-jin as Kim Eun-mi and Choi Soo-young as Kim Jin-hee as the mother -daughter duo is really nice.

Waiting for next episodes to air..