emeraldarrows

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.

Both FLs are powerful and immortal, MLs are human. Both SMLs have a long time obsessive love for the FL. Both are xianxias with a similar vibe.

Both MLs are depressed and at the lowest part of their lives when they encounter the FL who they view as their salvation. Both MLs become stalkers, finding ways to get close to the FL, with her having no knowledge of their shared past/former meeting.

Both MLs are ill tempered CEOs who receive a heart transplant from/believed to be from the FL's boyfriend. The FL is the ML's employee. Both MLs fall in love with the FL and slowly become better people, while FL takes longer to sort out her feelings and past love for her boyfriend vs. the ML. Both have a scheming SML who tries to drive them apart so he can have both the FL and ML's business.