Both MLs wear glasses and come from a wealthy family. For their own reasons they find a look alike woman to impersonate their sister or fiancée.
Both are about the ML and FL who start out close and then the FL's family either destroys who the ML wrongly believes they destroyed his family. Years later the two meet again, the ML having drastically changed and now cruel to the FL as he seeks revenge. Slowly, her kindness toward him changes him back to who he once was.
Both are short fantasy dramas centered around magical mirrors/reflections and a mystery.
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Both are a trio of friends/love triangle between two MLs and a FL who live on the same street. Both have a nostalgic feel with the FL starting out crushing on a different ML than she ultimately ends up with.
Both feature mermaids and evil humans causing environmental problems for the ocean which the mermaids are trying to stop.
Both are xianxia dramas in which the FLs are plant fairies and the MLs are doctors with a cold personality.
Both are xianxia mini dramas in which the FL is a cheerful plant fairy and the ML has a cold personality.
Both are Chinese fantasy mini dramas in which the FL is a cheerful plant fairy who the ML encounters.
Both MLs are healers with a divine past and a cold personality and the FLs are herb fairies with a cheerful and endearing personality.
Both are xianxia dramas in which one of the leads is trapped in a place and freed by the other lead, causing the two to be bonded so that whatever happens to one (emotions or injury) is felt by the other. Both FLs are plant fairies.
Both FLs are from modern day and meet the MLs who are in/from ancient times. Both MLs are supernatural beings whose life is tied to a tree, with the tree reflecting what happens to them/how they're feeling (blooming withering, etc.).
While SG is far more intense and gruesome, both have the similar concept of a group of people, mostly strangers, who are coerced by a shady person into playing games where they will die or fall into a coma if they fail to pass each level. Both have scenes where someone is watching the games on a screen.
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