Both are mini dramas in which the ML is allergic to all women except the FL.
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Both are mini dramas in which the ML is allergic to all women except the FL.
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Both are mini dramas in which the ML is allergic to all women except the FL.
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Both are mini dramas in which the ML is allergic to all women except the FL.
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Both are mini dramas in which the ML is allergic to all women except the FL.
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Both are mini dramas in which the ML is allergic to all women except the FL.
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Both MLs are rich and either disabled or ill, FLs have secret motives and pretend to be mentally disabled.

Both FLs pretend to be mentally disabled/ill in order to achieve their goals, both MLs are wealthy men who take them in, unaware of their motives.

Both are short length dramas in which the ML keeps and torments the FL, blaming her for the death of his family member. She eventually becomes pregnant and tries to protect herself and the child against the evil people around her.

Both MLs have the FL pose as their sister due to her identical appearance and to enact his plot. Both MLs wear glasses and have an initially aggressive personality until they fall in love.

Both are about the ML in the future trying to prevent the FL's death in the past by connecting with her through her cellphone.

Both have the same general plot and similar scenes, with the M L hiding his past from the FL who is his wife and in law enforcement, as all the while she begins to suspect him of being a murderer. SOY shifts the setting to ancient China, while FOE is modern day South Korea.