Story: The story starts with a bang and picked my interest right away. Within a couple episodes I had my hands full with some characters I got attached to already. I feel grateful that the viewer gets a strong female character with Chu Ran that doesn't act silly or jealous even though she has feelings for one of the male leads.
What I disliked was the story development. There's a lot of dead ends because people who have information on the bad organisation repeatedly die without revealing anything. At some point it's getting predictable and frustrating. Also because the "good side" suffers setbacks often, maybe even too often to still look realistic.
Closer to the end the cat and mouse play between the evil mastermind and Jiang Yuelou gets overwhelming and by that point I could already predict with 100% accuracy what will happen next which left a real bitter taste.
Also, the story does not do the characters justice, the least for the main leads. In the end it leaves you disappointed or even enraged, depending on how much you rooted for certain characters. Personally, I think this drama should come with a disclaimer to not get emotionally attached to ANY character in the drama unless you like to see your favorite character suffer.

Characters: This drama has lots of interesting characters. It starts with Jiang Yuelou who's a character with a backstory that shaped him to the person we see in the drama. (I have to say though, I don't buy the psychic component of Jiang Yuelou's character development. His past is affecting him a lot, so his psychic condition in the end leaves quite some doubts to me.)
In the beginning it's like black n' white to see Yuelou with Chen Yuzhi, a kind and dedicated doctor who does not differ between good or evil when it comes to his patients. Their relationship progress and forming bond of brothers/soulmates becomes a joy to watch throughout the drama. I mentioned Chu Ran before, she's a smart, mature character.
Jin Dacheng comes off as arrogant and shady at first but he was the one responsible for the funniest moments in the drama.
To avoid spoilers I won't mention names. Let's just say that the villain was indeed a twisted/complex character and one you could actually feel sympathy for because there's no clear black or white.

Acting/Cast: The cast did a good job and I think the actors/actresses where well-chosen for their roles. I just wish the script would give them justice because to me it seems like great talent being wasted to a storyline that could've been so much better.

Music: One of my favorites in the drama. It has really beautiful background music and melodic theme songs. Definitely an OST I will keep listen to.

Rewatch Value: Really low because once you know who's the villain the fun of guessing and combining clues is gone. Since the drama contains lots of (emotional) suffering for the characters and the audience I'm not really fond of repeating that.

Overall: 7/10 This could've been such a great drama if it wasn't for the lack of story progress and logic here and there and the disappointing plot in general that lead to an unsatisfying end. Without this flaws I could've easily given the drama a higher rating because I liked the characters, the setting in Republican Era (the costumes), the OST, the acting.