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Characters: 

LUC: He's a typical Frenchman. He's very romantic and he'll help Kate to join Charlie's love.

KATE: She's quite beautiful and she's really in love with Charlie. And she'll fight for this love.

 

JULIETTE: She's the new French, beautiful, rich and young Charlie's girlfriend. She's from Paris.

 

CHARLIE: He's Canadian. He's Kate's ex-boyfriend. He travels to Paris for work and he fell in love with Juliette.

Compare the characters Kate-Juliette and Charlie-Luc:

Kate-Juliette: Juliette is more beautiful than Kate. But Kate is more seduictive. Kate loves Charlie and she tries to fight for this love, Juliette doesn't want to "fight".

Charlie-Luc: Luce is more romantic than Charlie. Luc has helped Kate and finally kate decides to stay with him. Charlie decides to stay with Juliette.

Juliette:

Juliette: I'm a glamorous and elegant French woman.
One day in París I met a handsome Canadian man, called Charlie. We were in live. But he was engaged with kate, she was a Canadian woman. He talked to her and left his fiancé. He was in love with me. 
One day, Kate, came to París to talk to him and destroyed our relationship. But she couldn't, because of her fault I finally had and argument.