Both Female leads have this sixth sense that helps them solve crimes. However, it's more prominent in "Girl who sees smells".
Both plots involve a lot of drama as the gang solves cases including solving their parents case.

Both female leads find out they're connected to royalty. Both shows start off from rags to riches, then suddenly they become royalty with money. Both Female leads have this quirky way of doing things, which makes sense, as they are learning how to live differently from what they've known their whole lives.

For one, both characters are named Tae Gong Shil. Both dramas pertain to ghosts, and a character seeing ghosts at that. Well, not to mention the obvious point that it's a parody off of this show and The heirs.

In Waking Love up and Shopping King Louie, both male leads take up a memory loss, their rich lives forgotten. In both dramas, the girl is poor, but tends to help them throughout their journey.