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Both are disaster movies with a group of characters trying to survive, while also focusing on the relationships between them.
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Both are about a workplace romance between two people who's relationship doesn't start out positively. Both are fun and lighthearted without conflict just for the sake of angst.
Both dramas are based off of a mystery that happened in the past but significantly affects the characters in the present. Both have passionate cops who must partner with another to solve a murder mystery. Although two cops is more of a comedy, in both dramas there is a character who must come to terms with a fantastical/unbelievable situation. Lost spirit vs time travelling walkie-talkie signal.