I think the same as you. Triage and Manner of Death focused on investigations, However, the two couples also had romantic moments. I felt the love of Bun and Tan and Tin and Tol with every look.
It's not perfect, it was above average for Thai series. My biggest problem with this show was that it wanted to cover both volumes in few episodes. Compared to Manner of Death and Triage, something was missing. There are characters that even without a kiss you feel love in their eyes, it's not their case.
I don't think there will be a second season, they merged the two volumes of the novel. The end of the show is the same as history trapped, Kan has to pay for his crimes.