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Friendship between the girls is the concept of both drama and movie. And also the envy that is growing when one of them become succesful.
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Both dramas present the struggles of high-schoolers in order to become no.1. And also, both dramas have kids forced by their own parents to follow a certain path in live they actually don't want to.
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Both movie have same kind of concept. A boy is forced to became a monster. If Hwayi: A Monster Boy presents the story of a 'not-wanna-be-a-monster' boy, in Monster, the lead became a monster by his own choice.
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Both leads have a supernatural power and that's why they're using their power to save others. You can see a good-evil 'fight' in both dramas.
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These 2 dramas are kind of similar. The male lead is an idol who's totally a jerk while the female lead has a strong and crazy personality. The first love of the male lead is also a famous singer and you can see scandals in both dramas. They're combining music with love and another similarity is that the leads are fighting with each other in the beginning.
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Both dramas are about music industry. In both you'll be able to see a group of 'kids' trying their best to debut, true friendships and loyality, love between an idol and a non-idol, achieving dreams, dating issues and the most important: a music company lying fans in order to cover their idols and keep their company up.
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In both dramas the female lead is a celebrity who has her own career standing on the edge, while the male lead is an alien who has to live a limited time on the Earth and they both fall in love.