Lucy, the world’s most famous early human ancestor, is often called the "grandmother of mankind."

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Graduate student Ma Ke is writing a linguistic thesis on Lucy, who he believes possesses the earliest human language skills. Professor Li Tong, while questioning Ke’s argument, finds a clue in his paper that explains her daughter’s disappearance.

As Ma Ke grapples with his writing and reality, his mother, Haiyan, suddenly frequents his life. Haiyan leads Ke to the ancient and dilapidated house she has bought, and as they explore its mysteries, her innermost secrets and wishes gradually surface. Meanwhile, Ma Ke finds his own life blending with the world depicted in his thesis.

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Lucy’s figure emerges, shimmering with the call of love in her howl.