People moving from one body into another is just like people going back and forth in time, making a mess of who is who and the relatives. Some people enjoy it.
The development of the plot was confusing and slow, filled with meetings across 20 episodes, making it look like a play from Ancient Greece. The participants at these meetings kept rambling about the power structure in the Joseon-lookalike kingdom and an "ice stone". What was extremely unclear was the basis for what was legit and what wasn't in this magical world.
One thig was extremely clear: everything was fake as fake can be.