emeraldarrows

Both are mini dramas about a student/teacher romantic relationship.
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While one is BL and the other M/F, both are mini dramas that involve a pair of lovers whose story ended tragically in history. Now they are reincarnated and reunited in present day, but one has changed (different personality vs. different gender). Both have a connection to cuisine (working at a restaurant vs. making wine).

Both MLs were brainwashed/manipulated by a father or father figure into becoming an emotionless weapon which gives the ML great power. In both, the end of the training was the ML being forced to kill his own father in order to destroy his emotions/soul.

Both are historical mini dramas with two seasons in which the FL is betrayed by the man she loves, leading her to return with a different face to take revenge. In her plot she ends up involved with the man's brother who she eventually falls in love with.

Both are historical mini dramas with the same actor as the ML or SML. Both FLs are supposedly cursed/fated to be killed for the good of the kingdom, both MLs are princes who fall in love at first sight with the FL.

Both are historical mini dramas with more than one season and a similar feel/tone. Both have a general FL and adoring but scheming ML.

It continues the story.
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Both dramas are historical/fantasy involving face/body swapping and a love triangle between an emperor SML, his warrior brother ML, and the FL who is initially closer to the SML before she meets or falls in love with the ML. Both dramas have similar themes of obsession, revenge, mistaken identities, and a plot point where a male character keeps his female love interest who is believed to have died on a bed of ice, then revives her near the end of the drama. Both dramas conclude with the FL and ML marrying and having a child.

Both are mini dramas with a historical setting, although different eras. Both are about a married couple who has a secret secondary life as spies/assassins, unknown to each other. Both couples have very good chemistry.

Both are mini dramas with a Republican Era setting and the same actress as the FL.
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Both are mini dramas with a historical setting and the same actors as the main couple.
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Both dramas are about a person (ML vs. FL) who magically transforms into a very attractive person, allowing them to get close to the person they've had a crush on. Both have the same actor as the ML.