This is one of those underrated dramas that less people will get to watch. If you enjoy Ancient detective story lines you will enjoy the story but don't expect a big budget production or strong acting.

FL - Acting started out ok but later episodes got worse & worse as she can't portray the array of emotions needed. "love, anger, sad" all end up with this blank stare reciting lines.
ML 1 - I think he carried the show in terms of acting
ML 2 as Su Fu - I've enjoyed some of his other works and obviously he's manly hot but his lack of expression didn't do the role justice

What I enjoyed:
Mysteries that connected to the bigger mystery of the missing mom
The love triangle was well written, better than most actually. Instead of the standard 2nd lead syndrome she had real feelings for both although with Su Fu it's more because he saved her. A mysterious badass assassin that random shows up and rescues you is obviously appealing.
Xiao Song started off as a like/hate relationship. As the story continued they grew to love each other while she's trying to forget Su Fu for his betrayal (but which she didn't try to understand why? and she's "Miss Truth" WHAT WHAT??)
Nicknames for each other: Fish & Fox very cute.
Pace of the drama didn't feel slow. Not so many "filler" moments
Sidekick Sang Chen was a fun character

What's lacking
Obviously needed better acting
Story was a bit too fast, they founded clues super speed
Lack of character development, No depth to the characters. How they started out is how they ended
I really wished there was more story to the ML
Su Fu : Initially not too much background on him. Too many questions of why later episodes. Total downfall of a great character potential

What you will need to ignore:
Standard jumping out of water scenes and "insta dry" moments
The cheesy freeze flying fight scenes (low budget) not very well choreographed
The countless moments of she being knocked out, pass out and randomly wake up on a bed
The cheesy props
Last 2 ep. very rushed. Didn't make a lot of sense to me