The Living Sacrifice of the Hanging Coffin Village

An expedition enters a Miao village in search of the elixir of immortality said to lie in a hanging coffin. The villagers say they must send a living person into the coffin every ten years to accompany their ancestral spirits. A team member named A Ming is chosen. But inside the hanging coffin, he finds a diary: a hundred years ago, tomb raiders stole a Miao witchcraft manual and were cursed, trapped inside the coffin. The so-called living sacrifice is meant to make new tomb raiders open the door for them... Who are the true living dead? Are the villagers guardians of the tomb, or victims of the curse?