Same actor as ML. Similar historical setting, tone, and relationship between the main couple.
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ML has powers (shaman/sees ghosts vs. nine tailed fox) and FL is human. The couple had past lives and FL or both have now reincarnated and reunited in the present. Both couples must work to stop the powerful, supernatural villain from their past.

A quirky FL from the present day ends up in the body of a different girl in the past and has to live her life (dealing with a fiancée, etc.). Both have a fluffy, fun feel with a few serious moments.

A main character is a doctor (FL vs. ML). FL first meets the ML years before when he helps her in a situation, and then doesn't forget him during the years apart until they meet again. Their reunion, however doesn't go as FL planned at first.

Relationship between a bodyguard and the one he protects. Both are beautifully filmed, very moving, and emotional stories that have a unique and haunting tone.

Both MLs are aliens with special powers who are attempting to return home, only to decided to stay on earth, at the risk of their own lives, when they fall in love with the FL. The FL is a celebrity. Similar melancholy tone and star-crossed romance feel.

A main character (FL vs. ML) is thought of as dangerous and hunted down/attempted to be killed by the "good" people. They are saved and protected by the other lead. Both have similar tones and settings, and excellent battle scenes.

Both are Xianxia romances with many fascinating, complex characters. Similar elements include spiritual pets, settings, and tone.

The main character ends up inside a drama or story and ends up changing the plot. Both are short fun Chinese dramas with a similar vibe and neither plot takes itself seriously.

Despite differences in plot (L&tE has fantasy elements), FL is a servant who falls in love with royal ML. Their relationship is sweet and lovely and the plot has many fluffy moments with some serious ones.

FL travels to a different world through technology. ML appears to be the villain, and it takes time for the FL to warm to him/fall in love with him. FLs are quirky and fun.

Similar vibe, FL travels to a game vs. into a drama and must beat the system. Similar setting and fun, fast paced plot.