both dramas deal with the female lead divorcing her husband and falling in love with a guy who loved her before she divorced her husband .

Both are special dramas with unique and interesting stories.

Both medical dramas. To me at least, they left a very similar impression...

Both drama is about committing adultery. The male lead is having an affair with his wife's friend/best friend and how the female lead plot her revenge.

Both are about young people dealing with life threatening diseases and both have romance in it.

Both are about young people dealing with life threatening diseases.

both are suspense thrillers in the backdrop of the joseon dynasty..(though dream of 400 years is partly set in the modern times)..Futher the main theme is the quest of a woman..

Both stories have a main character who's able to see ghosts who often put him/her in awkward or humorous situations.

In both series the main girl works in either a café or nail shop while dressing as a boy. The setting of Nail Shop Paris reminded me of Ouran High School Host Club. Both series deal with little "side stories" of problems that either the clients that visit the café/ shop have, or problems the people who work there themselves have.