The characters details were portrayed delicately. Every scene, every facial expression, every line was important. Honestly if you paid attention to every detail since the 1st episode, you could probably figure out the person behind all of it. Anyways, there wasn't too much focus on the side characters, but there was enough screen time to make you feel attached to them. IMO the actors and actresses were chosen well for each character. The storyline itself is very beautiful in its own nature, and as other have said, nothing is black and white in this drama. Its mostly cause and affect, to watch the characters grow, the way the characters developed were smooth, and it is noticable.
Omg I love their clothing, it's so pretty, the sets were amazing and the CGI wasn't too horrible.
Tbh this is my first C-drama, I was drawn to watch it because many The Untamed crack vids came up on my YouTube feed. I don't like watching dramas longer than 20 episodes but this drama kept me hooked till the end. I have also never had a drama that would make want to read the novel, to do a rewatch marathon and also watch the breakdown on the scenes.