As a novel reader I'd say this drama adaptation is 85% fan fiction. I'll try to enjoy it for what it is, but I'm slightly disappointed because I loved the novel & all the characters so much.
He is actually one of my favorite characters in the novel… clever, truly concern about the world and his feelings…
The drama is very different from the novel. I wouldn't even call this an adaptation...it's a derivative work imo. I'm enjoying the drama for what it is and have force the adaptation snob in me to view the drama as it's own "original work".
I've never watched anything with him. Which drama should I watch first?
Depends on your mood. I'd suggest Healer (action/romance) Empress Ki (historical - his performance is outstanding) or Suspicious Partner (Romcom/mysteryish)