I'm not really into detective/Sherlock Holmes type of drama, but I do like the martial arts aspect of this one. I find the ML charismatic, and I enjoyed watching his facial expressions/acting. The FL has a strong character, independent and not "whiny" or acting childish like a lot of the other dramas.
The 1st 20 episodes were fast paced and suspenseful, the middle was a little dragging (evil sister kept coming back, boring cases), and the ending was not the best . It is still a happy ending though, but they left it open for a 2nd season w/c may not happen at all.