Pretty boring honestly. Male lead has no role basically except being a puppy for the female lead. She is dull for the most part and I didn't find the chemistry to be good either.
It still got boring I skipped a lot in the end. The overall concept was very good and I think it would have been better if they focused on multiple cases rather than just 1 just like the one in episode 1 which was my favorite. Anyway it was good not something like reset which was way better. About the romance thing it would have been okay if it was not forced :)
It became repetitive and predictable. There was no suspence whatsoever since we knew that the final trial is the fifth one. Also unnecessary romance with no chemistry.