9. The Immortal Ascension
Iirc, like the one who's taking over the body of the blacksmith that has a wife and a daughter and he tries to kill Han Li, giving out a place for a treasure but the place has a scary keeper/monster. Cmiiw.
I didn't know that I have to specify the blacksmith's identity. Arthdal Chronicle was the answer my younger brother gave me (because I was on a road trip and I got distracted, why not asking him) so I wasn't sure which one, but he's sure of its existence. In Ever Night, I was quite sure it's one of the leads' friend, more likely the male lead's friend. Feels like there's at least two or three episodes involving him. It's an adventure drama, meeting various type of people with exceptional talent in each of their fields.