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Personally they give off the same vibe and they are both also definitely a rollercoaster of emotions.

Both historical dramas. Similar headstrong and stubborn female lead. Also similar conspiracies in the royal family storyline.

1) Both of the girls fall in love with a man (the male lead) they are not supposed to.
2) The men they both love are power hungry and will do anything to get what they want
3) The male lead then tries to win back their love after realizing they have lost it
4) Both male leads forced to marry another woman for power whilst being married to the female lead simultaneously and leaves her to her own devices to try and protect her.
5) Both female leads leave the male lead (or attempts to)

Differences:
1) In the world of love, the male lead is more ruthless to the female lead, leaving her out to die and even trying to kill her to get what he wants (although he regrets it)
2) Female lead in world of love manages to leave and is even betrothed to someone else after leaving the male lead before being forced back again

There aren't tons of dramas focused on the role of media and journalism in today's world, especially with information at everybody's fingertips. Falsify tackles media in a similarly impactful way with a very different storyline and pace but the overall message about how the media must be honest and unbiased in their work for the common everyday people remains the same.

Have't watch it,but basicly it is a tv series adaptation, different actor and actress. I love the story so muchhhhh, so i will watch this tv series

They both have vampire boyfriends. Must be an ongoing trend considering MAB was last year. Do you think Twilight started this?

Both main female and male leads are devoted only to each other. Both are historical with politics, but the main focus is on the love story between the leads.

In both the girl tells a story of her high school, about her life, friends, how she fell in love.
Both of movies/drama has those similar 'feelings' because action takes place in 1990s :D

Similarities :
The story is based on Time Travel.....
They have Power struggle between royals...
Main lead travel from modern day to historical era.....
Both have parallel world

both are female teachers who are bullied by their students but then grow a bond with them, in gokusen she is the heiress of a gang and is strong physically and helps her troubled students earning their respect, whilst in biscuit teacher she is weaker than the students make her out to be , gokusen hasn’t got any romance in like biscuit teacher but is just as enjoyable

Both have a focus on strong female friendship groups and also their love lifes, the up's and the down's.

Both focuses on women 30+ finding love but the biggest similarity is the close female friendships and how they all experience different loves and relationship challenges.

Both dramas are about how the main characters overcame their adversities through life when everyone else had no faith in them. The relationships that helped them through difficulties and how the people around them provided unwavering support to them. The main theme of hope and finding passion in what you do.

Both dramas have strong female leads who have an emotional back story which leads their decisions of creating a fake mother relationship

Both are base on the famous novel : Les liaisons dangereuses from Pierre Choderlos de Laclos. The story was about a lord Xie Yifang who decided to seduce Du Fenyu , a widow who seems to be his uncle's granddaughter in order to win the bet he did with Miss Mo . Indeed she promised him that if he succeed in seducing Fenyu, she will be her woman for one night.
He thought Fenyu l was an easy goal yet it seems like she is different from other women. Finally, he made it, she is in love with him but what unexpected is the fact Xie Yifang falls for her too. You can see she was the first woman he truly love. Miss Mo seems to be jealous so she decided to trick him. At the end, they can't be together even if they know they were meant to be.
Actually it is an interesting story with a SE.
If you want to know more about the french version , I recommend you the manga version drawn by Chiho Saitou. But if you like french litterature you can read it .