emeraldarrows

Both MLs have the mysterious ability to shift into different people and have a special connection with the FL who can cure or heal them.

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Both dramas are about the leads in parallel/different timelines - ML in the future, FL in the past - communicating through a cellphone.

Both are about the ML in the future communicating with the FL in her school days in the past through a cell phone.

Both are Republican Era mini dramas in which one or both of the leads are caught in a time loop, trying to prevent future events and thwart the villain's plans.

Both FLs disguise as men and become generals in the army. Both MLs are stoic but kind hearted generals who learn FL's secret. Both have a scene in which ML encounters FL in a bath and she tries to hide from him so he doesn't discover she's female.

Both are mini dramas in the mystery and wuxia genres. Both have strong bromance and one of the MLs is either morally gray or suspected of having done something horrible by the other ML.

Both are Thai BLs in which one of the MLs is fated to die soon and the other ML is clairvoyant/has supernatural abilities.

Both FLs are humans who were born with heart defects and as a child magically absorbed a scale from the ML which healed them. Both MLs are supernatural beings looking for that scale.

One is the drama, the other a fun reality show spin off with the cast.
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Both are Japanese dramas in which the leads grew up next door to each other and the ML has secretly been in love with the FL for a while. He finally confesses, startling the FL, and the two must then navigate whether to risk their friendship by being in a romantic relationship,

Both FLs are under a curse that causes them to shift either their souls to a stranger's body or shift their appearance, appearing as different people.