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Both dramas are action dramas with amazing action scenes and with a very similar dark and mature atmosphere.

Kim So Hyun shows her excellent acting skills, while also portraying an almost typical high school teenager girl, with added problems including bullying and the loss of a loved one.

Not only does the main female protagonist care deeply for their child, they both feel deeply to bring justice to the world and shut criminals away. They also have their detective male leads who would rather run to their side than chase after a criminal.

Both of the main male protagonists try to find out more about their past and find out clues as to what caused a past incident to happen. And the main female leads always stick with the man's side, despite going through their own difficulties.

Both male lead have a temper and goes to great length to get the girl. Both lead are in a powerful positions and the main females are tough chick, and take no sh*t from them lol.

The leading male both know what they want and who they love. They also powerful and doesn't let anything stand in their way of getting the girl

Loads of similarities! Both have a younger man, who do interpretive dance and is feeling lost in life, fall for an older woman, who is also in need of some company and someone to trust. The tone is very different but the characters are surprisingly similar.

It has same story line but it's only made in japan. Both versions come from the original japanese manga ''Itazura na Kiss''

In both specials there are female ghosts who haunt a man until secrets are revealed.

they both have the girls fiance willing to become monsters to find their lovers captors, My Beautiful Bride is not horror based and has some romance.

Both have cohabitation hijinks and both are love stories about a star and a regular girl.

Both movies focus on love and power struggle intrigues behind the closed doors of the Imperial Palace.

Both involve ghosts that inhabit another person's body to figure out the mystery of their deaths. In Who Are You?'s case it's a father that inhabits the body of a cold young man. The father attempts to make things right with his daughter as they had a falling out before he died. In the process the man who's body the father inhabits falls in love with the daughter. He and the father team up to protect the daughter from whoever killed her father while they solve the mystery.

It's really really funny and the romance is sweet as well. I think the whole possession concept is handled a little better in Who Are You than in Oh My Ghostess.

Both are complicated time travel dramas that involve the main character going back in time to better their future. But consequences of time travel are their biggest foes.

Written my the same writer.
Also the same type of theme with the main lead having her identity taken by someone close to her.