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An older woman-younger man relationship. The woman takes things seriously while the man likes to "live his life".
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In both series the sister is a devil in disguise. Everyone seems to be mistaken about her true character.
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Both are live-actions and are about survival games. Who's the best? Who will win the game ?
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In both series the main couple meet accidentally many times. The girl even comes to his house invited by one of his family's member.
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The two series are alike when it comes to the relationships between the family members. In both the girl has to suffer the bulling from her step-mother and step-sister. Also both girls seem to like the same man.
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The main guy's character is similar in both series, at first he's weak and then changes both physically and mentally. He becomes stronger.
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In both series the boy has a weak character and is dominated by a strong-willed girl.
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In both series the man is much younger than the woman and while the relationship starts as too people that make a sort of contract, they end up getting close to each other.
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These two series are very very much alike. From the best-friend steals boyfriend to many things that happen after that event.
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In both series the male lead is crazy, adorable and immature. Let's also add the funny situations and the falling in love factor that changes their universe.