I really enjoyed Phantom Lawyer. One of my new favorite shows, and one I hope gets a second season, although I hear that's rare.
Anyway, the question I had was with regards to the spirits floating. The first few episodes, the spirits would float, only setting foot on the ground when they find out their name and date of birth. Later on, they changed that in-universe rule, and Attorney Shin even acknowledges the sudden change when he encounters Attorney Han's sister, but the reason is never explained.
Maybe I missed it, but do they ever explain this change in the show? Or maybe it was done for production reasons, for example cost of rigging or special effects or perhaps having a floating spirit for half an episode was distracting or taking away from the cohesiveness of a scene.