emeraldarrows

Both are short length dramas where the leads are race car drivers, one of whom has a false identity.

Both are BLs with a similar vibe and relationship between the leads - one MLs is involved in criminal or shady business, the other a hardworking talented and upright person.

Both are BLs in which one of the MLs is a gang leader and the other a good guy who finds himself deep in the world when he falls in love.

Both are mini dramas in which a female police officer and a FL with a personal connection/trauma team up to solve gruesome cases.

Both are mini dramas with a melancholy tone and palace setting. Both leads have hidden and swapped identities and both FLs reign as emperor, making difficult decisions and purging the courts. Both FLs seemingly care about the ML, but put the country above him. Both have tragic endings.

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My Name Is Zhao Wu Di: Starting Over is a sequel.
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Both are short length dramas in which the modern day FL transmigrates into a fictional world with a Qing Dynasty setting (novel vs. drama) and becomes a maid at the palace. She tries to keep the story on track and falls in love with the cold prince.

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Meteor Garden is a remake of Hana Yori Dango which Boys Over Flowers is a sequel/connected universe story of.

Same universe, connected stories, same setting.
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Both MLs are gods, FLs are considered evil, and their love is forbidden by the heavens. Both couples have a tragic past life in which one seemingly betrayed the other. Both FLs become pregnant and the child is hidden away.