Similarities:-
1. FL is reincarnated while ML is an Immortal
2. FL caused the ML to become an Immortal
3. FL is reincarnated to become a good hearted girl
4. ML doesn't like FL
5. ML wants to die using FL

ML is a 38 year old man with a difficult life gets a new chance at life when one day he becomes an 18 year old high school boy

Male lead had a crush on female lead....they met after many years ... She is now an NIS agent infiltrate his company... In the end she is an agent who becomes girlfriend with the ML

This drama is pretty good too....the soul of girl from modern era get stuck in the body of the princess....this drama was also comedy time travel with great chemistry in the leads

In this too both leads has the ability to foreseen the future....plus the female lead in this drama also has foreseen her death

In this too the ghost of main lead's dead girlfriend create chaos in the life of all the woman surrounding the main lead to the extent of killing them

Both are fantasy drama in which female leads uses her own power to exorcise the haunted places and hence became a successful real estate agents.

The dramas are set in different time period but
Similarity
-> Same female lead (Sabrina Chen)
-> Both female leads cross dressed in the drama to enter a place where women are not allowed
-> Both male leads knew from start that female lead is a woman and they try to protect their identity and live with the female lead in same space
-> Both male leads have problem in the eyes which gets cured later in the dramas

There are certain similarity in both dramas

#1 The personality of male leads in both drama is same... both are celebrities, childish, arrogant and narcissistic.

#2 Female leads are working hard in their respective fields but still struggling.

#3 There is a misconception of relationship between artist and manager in both dramas

#4 Second male lead in both dramas are nice, kind, gentle and know female lead from their childhood

In this also the male lead mother is dead who was the first wife of the emperor while the other prince mother is current empress who is also the relative (sister here, daughter there) of prime minister...so prime minister is trying every way possible to make sure his nephew becomes the next king

This is the Thai remake of original korean version....they have same story ....this remake was said to be the best remake (haven't watched all parts speaking on the views of others) among all the remakes of this drama.....the actors were good....male lead was handsome and female lead was funny...I loved this drama

Original korean drama....adapted from same manhwa...it's the first version that came out in 2004... difference is in this female lead is songwriter and in that she is scriptwriter.....same for respective male leads one is pop star and other is an actor...it means both main leads are related to each other profession wise