"Watashi wo Moratte": Tsuioku Hen (2024)

Both are part of the same series.
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"Watashi wo Moratte": Koiji Hen is the sequel to this drama.
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Both with a lead that can see the ghost of the other lead, and both has a connection between the FL and ML with a mystery to be solved

Both dramas are focused on the fact that the male leader has became a ghost and can only be seen by the female leader.